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-rw-r--r--meta/recipes-multimedia/webp/files/CVE-2023-4863-0001.patch366
1 files changed, 366 insertions, 0 deletions
diff --git a/meta/recipes-multimedia/webp/files/CVE-2023-4863-0001.patch b/meta/recipes-multimedia/webp/files/CVE-2023-4863-0001.patch
new file mode 100644
index 0000000000..419b12f7d9
--- /dev/null
+++ b/meta/recipes-multimedia/webp/files/CVE-2023-4863-0001.patch
@@ -0,0 +1,366 @@
+From 902bc9190331343b2017211debcec8d2ab87e17a Mon Sep 17 00:00:00 2001
+From: Vincent Rabaud <vrabaud@google.com>
+Date: Thu, 7 Sep 2023 21:16:03 +0200
+Subject: [PATCH 1/2] Fix OOB write in BuildHuffmanTable.
+
+First, BuildHuffmanTable is called to check if the data is valid.
+If it is and the table is not big enough, more memory is allocated.
+
+This will make sure that valid (but unoptimized because of unbalanced
+codes) streams are still decodable.
+
+Bug: chromium:1479274
+Change-Id: I31c36dbf3aa78d35ecf38706b50464fd3d375741
+
+CVE: CVE-2023-4863
+
+Upstream-Status: Backport [https://github.com/webmproject/libwebp/commit/902bc9190331343b2017211debcec8d2ab87e17a]
+
+Signed-off-by: Soumya Sambu <soumya.sambu@windriver.com>
+---
+ src/dec/vp8l_dec.c | 46 ++++++++++---------
+ src/dec/vp8li_dec.h | 2 +-
+ src/utils/huffman_utils.c | 97 +++++++++++++++++++++++++++++++--------
+ src/utils/huffman_utils.h | 27 +++++++++--
+ 4 files changed, 129 insertions(+), 43 deletions(-)
+
+diff --git a/src/dec/vp8l_dec.c b/src/dec/vp8l_dec.c
+index 93615d4..0d38314 100644
+--- a/src/dec/vp8l_dec.c
++++ b/src/dec/vp8l_dec.c
+@@ -253,11 +253,11 @@ static int ReadHuffmanCodeLengths(
+ int symbol;
+ int max_symbol;
+ int prev_code_len = DEFAULT_CODE_LENGTH;
+- HuffmanCode table[1 << LENGTHS_TABLE_BITS];
++ HuffmanTables tables;
+
+- if (!VP8LBuildHuffmanTable(table, LENGTHS_TABLE_BITS,
+- code_length_code_lengths,
+- NUM_CODE_LENGTH_CODES)) {
++ if (!VP8LHuffmanTablesAllocate(1 << LENGTHS_TABLE_BITS, &tables) ||
++ !VP8LBuildHuffmanTable(&tables, LENGTHS_TABLE_BITS,
++ code_length_code_lengths, NUM_CODE_LENGTH_CODES)) {
+ goto End;
+ }
+
+@@ -277,7 +277,7 @@ static int ReadHuffmanCodeLengths(
+ int code_len;
+ if (max_symbol-- == 0) break;
+ VP8LFillBitWindow(br);
+- p = &table[VP8LPrefetchBits(br) & LENGTHS_TABLE_MASK];
++ p = &tables.curr_segment->start[VP8LPrefetchBits(br) & LENGTHS_TABLE_MASK];
+ VP8LSetBitPos(br, br->bit_pos_ + p->bits);
+ code_len = p->value;
+ if (code_len < kCodeLengthLiterals) {
+@@ -300,6 +300,7 @@ static int ReadHuffmanCodeLengths(
+ ok = 1;
+
+ End:
++ VP8LHuffmanTablesDeallocate(&tables);
+ if (!ok) dec->status_ = VP8_STATUS_BITSTREAM_ERROR;
+ return ok;
+ }
+@@ -307,7 +308,8 @@ static int ReadHuffmanCodeLengths(
+ // 'code_lengths' is pre-allocated temporary buffer, used for creating Huffman
+ // tree.
+ static int ReadHuffmanCode(int alphabet_size, VP8LDecoder* const dec,
+- int* const code_lengths, HuffmanCode* const table) {
++ int* const code_lengths,
++ HuffmanTables* const table) {
+ int ok = 0;
+ int size = 0;
+ VP8LBitReader* const br = &dec->br_;
+@@ -362,8 +364,7 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
+ VP8LMetadata* const hdr = &dec->hdr_;
+ uint32_t* huffman_image = NULL;
+ HTreeGroup* htree_groups = NULL;
+- HuffmanCode* huffman_tables = NULL;
+- HuffmanCode* huffman_table = NULL;
++ HuffmanTables* huffman_tables = &hdr->huffman_tables_;
+ int num_htree_groups = 1;
+ int num_htree_groups_max = 1;
+ int max_alphabet_size = 0;
+@@ -372,6 +373,10 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
+ int* mapping = NULL;
+ int ok = 0;
+
++ // Check the table has been 0 initialized (through InitMetadata).
++ assert(huffman_tables->root.start == NULL);
++ assert(huffman_tables->curr_segment == NULL);
++
+ if (allow_recursion && VP8LReadBits(br, 1)) {
+ // use meta Huffman codes.
+ const int huffman_precision = VP8LReadBits(br, 3) + 2;
+@@ -434,16 +439,15 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
+
+ code_lengths = (int*)WebPSafeCalloc((uint64_t)max_alphabet_size,
+ sizeof(*code_lengths));
+- huffman_tables = (HuffmanCode*)WebPSafeMalloc(num_htree_groups * table_size,
+- sizeof(*huffman_tables));
+ htree_groups = VP8LHtreeGroupsNew(num_htree_groups);
+
+- if (htree_groups == NULL || code_lengths == NULL || huffman_tables == NULL) {
++ if (htree_groups == NULL || code_lengths == NULL ||
++ !VP8LHuffmanTablesAllocate(num_htree_groups * table_size,
++ huffman_tables)) {
+ dec->status_ = VP8_STATUS_OUT_OF_MEMORY;
+ goto Error;
+ }
+
+- huffman_table = huffman_tables;
+ for (i = 0; i < num_htree_groups_max; ++i) {
+ // If the index "i" is unused in the Huffman image, just make sure the
+ // coefficients are valid but do not store them.
+@@ -468,19 +472,20 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
+ int max_bits = 0;
+ for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; ++j) {
+ int alphabet_size = kAlphabetSize[j];
+- htrees[j] = huffman_table;
+ if (j == 0 && color_cache_bits > 0) {
+ alphabet_size += (1 << color_cache_bits);
+ }
+- size = ReadHuffmanCode(alphabet_size, dec, code_lengths, huffman_table);
++ size =
++ ReadHuffmanCode(alphabet_size, dec, code_lengths, huffman_tables);
++ htrees[j] = huffman_tables->curr_segment->curr_table;
+ if (size == 0) {
+ goto Error;
+ }
+ if (is_trivial_literal && kLiteralMap[j] == 1) {
+- is_trivial_literal = (huffman_table->bits == 0);
++ is_trivial_literal = (htrees[j]->bits == 0);
+ }
+- total_size += huffman_table->bits;
+- huffman_table += size;
++ total_size += htrees[j]->bits;
++ huffman_tables->curr_segment->curr_table += size;
+ if (j <= ALPHA) {
+ int local_max_bits = code_lengths[0];
+ int k;
+@@ -515,14 +520,13 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
+ hdr->huffman_image_ = huffman_image;
+ hdr->num_htree_groups_ = num_htree_groups;
+ hdr->htree_groups_ = htree_groups;
+- hdr->huffman_tables_ = huffman_tables;
+
+ Error:
+ WebPSafeFree(code_lengths);
+ WebPSafeFree(mapping);
+ if (!ok) {
+ WebPSafeFree(huffman_image);
+- WebPSafeFree(huffman_tables);
++ VP8LHuffmanTablesDeallocate(huffman_tables);
+ VP8LHtreeGroupsFree(htree_groups);
+ }
+ return ok;
+@@ -1354,7 +1358,7 @@ static void ClearMetadata(VP8LMetadata* const hdr) {
+ assert(hdr != NULL);
+
+ WebPSafeFree(hdr->huffman_image_);
+- WebPSafeFree(hdr->huffman_tables_);
++ VP8LHuffmanTablesDeallocate(&hdr->huffman_tables_);
+ VP8LHtreeGroupsFree(hdr->htree_groups_);
+ VP8LColorCacheClear(&hdr->color_cache_);
+ VP8LColorCacheClear(&hdr->saved_color_cache_);
+@@ -1670,7 +1674,7 @@ int VP8LDecodeImage(VP8LDecoder* const dec) {
+ // Sanity checks.
+ if (dec == NULL) return 0;
+
+- assert(dec->hdr_.huffman_tables_ != NULL);
++ assert(dec->hdr_.huffman_tables_.root.start != NULL);
+ assert(dec->hdr_.htree_groups_ != NULL);
+ assert(dec->hdr_.num_htree_groups_ > 0);
+
+diff --git a/src/dec/vp8li_dec.h b/src/dec/vp8li_dec.h
+index 72b2e86..32540a4 100644
+--- a/src/dec/vp8li_dec.h
++++ b/src/dec/vp8li_dec.h
+@@ -51,7 +51,7 @@ typedef struct {
+ uint32_t* huffman_image_;
+ int num_htree_groups_;
+ HTreeGroup* htree_groups_;
+- HuffmanCode* huffman_tables_;
++ HuffmanTables huffman_tables_;
+ } VP8LMetadata;
+
+ typedef struct VP8LDecoder VP8LDecoder;
+diff --git a/src/utils/huffman_utils.c b/src/utils/huffman_utils.c
+index 0cba0fb..9efd628 100644
+--- a/src/utils/huffman_utils.c
++++ b/src/utils/huffman_utils.c
+@@ -177,21 +177,24 @@ static int BuildHuffmanTable(HuffmanCode* const root_table, int root_bits,
+ if (num_open < 0) {
+ return 0;
+ }
+- if (root_table == NULL) continue;
+ for (; count[len] > 0; --count[len]) {
+ HuffmanCode code;
+ if ((key & mask) != low) {
+- table += table_size;
++ if (root_table != NULL) table += table_size;
+ table_bits = NextTableBitSize(count, len, root_bits);
+ table_size = 1 << table_bits;
+ total_size += table_size;
+ low = key & mask;
+- root_table[low].bits = (uint8_t)(table_bits + root_bits);
+- root_table[low].value = (uint16_t)((table - root_table) - low);
++ if (root_table != NULL) {
++ root_table[low].bits = (uint8_t)(table_bits + root_bits);
++ root_table[low].value = (uint16_t)((table - root_table) - low);
++ }
++ }
++ if (root_table != NULL) {
++ code.bits = (uint8_t)(len - root_bits);
++ code.value = (uint16_t)sorted[symbol++];
++ ReplicateValue(&table[key >> root_bits], step, table_size, code);
+ }
+- code.bits = (uint8_t)(len - root_bits);
+- code.value = (uint16_t)sorted[symbol++];
+- ReplicateValue(&table[key >> root_bits], step, table_size, code);
+ key = GetNextKey(key, len);
+ }
+ }
+@@ -211,25 +214,83 @@ static int BuildHuffmanTable(HuffmanCode* const root_table, int root_bits,
+ ((1 << MAX_CACHE_BITS) + NUM_LITERAL_CODES + NUM_LENGTH_CODES)
+ // Cut-off value for switching between heap and stack allocation.
+ #define SORTED_SIZE_CUTOFF 512
+-int VP8LBuildHuffmanTable(HuffmanCode* const root_table, int root_bits,
++int VP8LBuildHuffmanTable(HuffmanTables* const root_table, int root_bits,
+ const int code_lengths[], int code_lengths_size) {
+- int total_size;
++ const int total_size =
++ BuildHuffmanTable(NULL, root_bits, code_lengths, code_lengths_size, NULL);
+ assert(code_lengths_size <= MAX_CODE_LENGTHS_SIZE);
+- if (root_table == NULL) {
+- total_size = BuildHuffmanTable(NULL, root_bits,
+- code_lengths, code_lengths_size, NULL);
+- } else if (code_lengths_size <= SORTED_SIZE_CUTOFF) {
++ if (total_size == 0 || root_table == NULL) return total_size;
++
++ if (root_table->curr_segment->curr_table + total_size >=
++ root_table->curr_segment->start + root_table->curr_segment->size) {
++ // If 'root_table' does not have enough memory, allocate a new segment.
++ // The available part of root_table->curr_segment is left unused because we
++ // need a contiguous buffer.
++ const int segment_size = root_table->curr_segment->size;
++ struct HuffmanTablesSegment* next =
++ (HuffmanTablesSegment*)WebPSafeMalloc(1, sizeof(*next));
++ if (next == NULL) return 0;
++ // Fill the new segment.
++ // We need at least 'total_size' but if that value is small, it is better to
++ // allocate a big chunk to prevent more allocations later. 'segment_size' is
++ // therefore chosen (any other arbitrary value could be chosen).
++ next->size = total_size > segment_size ? total_size : segment_size;
++ next->start =
++ (HuffmanCode*)WebPSafeMalloc(next->size, sizeof(*next->start));
++ if (next->start == NULL) {
++ WebPSafeFree(next);
++ return 0;
++ }
++ next->curr_table = next->start;
++ next->next = NULL;
++ // Point to the new segment.
++ root_table->curr_segment->next = next;
++ root_table->curr_segment = next;
++ }
++ if (code_lengths_size <= SORTED_SIZE_CUTOFF) {
+ // use local stack-allocated array.
+ uint16_t sorted[SORTED_SIZE_CUTOFF];
+- total_size = BuildHuffmanTable(root_table, root_bits,
+- code_lengths, code_lengths_size, sorted);
+- } else { // rare case. Use heap allocation.
++ BuildHuffmanTable(root_table->curr_segment->curr_table, root_bits,
++ code_lengths, code_lengths_size, sorted);
++ } else { // rare case. Use heap allocation.
+ uint16_t* const sorted =
+ (uint16_t*)WebPSafeMalloc(code_lengths_size, sizeof(*sorted));
+ if (sorted == NULL) return 0;
+- total_size = BuildHuffmanTable(root_table, root_bits,
+- code_lengths, code_lengths_size, sorted);
++ BuildHuffmanTable(root_table->curr_segment->curr_table, root_bits,
++ code_lengths, code_lengths_size, sorted);
+ WebPSafeFree(sorted);
+ }
+ return total_size;
+ }
++
++int VP8LHuffmanTablesAllocate(int size, HuffmanTables* huffman_tables) {
++ // Have 'segment' point to the first segment for now, 'root'.
++ HuffmanTablesSegment* const root = &huffman_tables->root;
++ huffman_tables->curr_segment = root;
++ // Allocate root.
++ root->start = (HuffmanCode*)WebPSafeMalloc(size, sizeof(*root->start));
++ if (root->start == NULL) return 0;
++ root->curr_table = root->start;
++ root->next = NULL;
++ root->size = size;
++ return 1;
++}
++
++void VP8LHuffmanTablesDeallocate(HuffmanTables* const huffman_tables) {
++ HuffmanTablesSegment *current, *next;
++ if (huffman_tables == NULL) return;
++ // Free the root node.
++ current = &huffman_tables->root;
++ next = current->next;
++ WebPSafeFree(current->start);
++ current->start = NULL;
++ current->next = NULL;
++ current = next;
++ // Free the following nodes.
++ while (current != NULL) {
++ next = current->next;
++ WebPSafeFree(current->start);
++ WebPSafeFree(current);
++ current = next;
++ }
++}
+diff --git a/src/utils/huffman_utils.h b/src/utils/huffman_utils.h
+index 13b7ad1..98415c5 100644
+--- a/src/utils/huffman_utils.h
++++ b/src/utils/huffman_utils.h
+@@ -43,6 +43,29 @@ typedef struct {
+ // or non-literal symbol otherwise
+ } HuffmanCode32;
+
++// Contiguous memory segment of HuffmanCodes.
++typedef struct HuffmanTablesSegment {
++ HuffmanCode* start;
++ // Pointer to where we are writing into the segment. Starts at 'start' and
++ // cannot go beyond 'start' + 'size'.
++ HuffmanCode* curr_table;
++ // Pointer to the next segment in the chain.
++ struct HuffmanTablesSegment* next;
++ int size;
++} HuffmanTablesSegment;
++
++// Chained memory segments of HuffmanCodes.
++typedef struct HuffmanTables {
++ HuffmanTablesSegment root;
++ // Currently processed segment. At first, this is 'root'.
++ HuffmanTablesSegment* curr_segment;
++} HuffmanTables;
++
++// Allocates a HuffmanTables with 'size' contiguous HuffmanCodes. Returns 0 on
++// memory allocation error, 1 otherwise.
++int VP8LHuffmanTablesAllocate(int size, HuffmanTables* huffman_tables);
++void VP8LHuffmanTablesDeallocate(HuffmanTables* const huffman_tables);
++
+ #define HUFFMAN_PACKED_BITS 6
+ #define HUFFMAN_PACKED_TABLE_SIZE (1u << HUFFMAN_PACKED_BITS)
+
+@@ -78,9 +101,7 @@ void VP8LHtreeGroupsFree(HTreeGroup* const htree_groups);
+ // the huffman table.
+ // Returns built table size or 0 in case of error (invalid tree or
+ // memory error).
+-// If root_table is NULL, it returns 0 if a lookup cannot be built, something
+-// > 0 otherwise (but not the table size).
+-int VP8LBuildHuffmanTable(HuffmanCode* const root_table, int root_bits,
++int VP8LBuildHuffmanTable(HuffmanTables* const root_table, int root_bits,
+ const int code_lengths[], int code_lengths_size);
+
+ #ifdef __cplusplus
+--
+2.40.0
+
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-05 17:06:32 +0000