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From c8af73112027fad0ecbb277e9cba257678c405af Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Wed, 7 Dec 2022 10:23:46 -0800
Subject: [PATCH] outieee: fix segfault on empty input
Fix the IEEE backend crashing if the input file is empty.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Upstream-Status: Backport [https://github.com/netwide-assembler/nasm/commit/c8af73112027fad0ecbb277e9cba257678c405af]
CVE: CVE-2022-46457
Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
---
output/outieee.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/output/outieee.c b/output/outieee.c
index cdb8333..8bc5eaa 100644
--- a/output/outieee.c
+++ b/output/outieee.c
@@ -919,7 +919,7 @@ static void ieee_write_file(void)
* Write the section headers
*/
seg = seghead;
- if (!debuginfo && !strcmp(seg->name, "??LINE"))
+ if (!debuginfo && seg && !strcmp(seg->name, "??LINE"))
seg = seg->next;
while (seg) {
char buf[256];
@@ -954,7 +954,7 @@ static void ieee_write_file(void)
/*
* write the start address if there is one
*/
- if (ieee_entry_seg) {
+ if (ieee_entry_seg && seghead) {
for (seg = seghead; seg; seg = seg->next)
if (seg->index == ieee_entry_seg)
break;
@@ -1067,7 +1067,7 @@ static void ieee_write_file(void)
* put out section data;
*/
seg = seghead;
- if (!debuginfo && !strcmp(seg->name, "??LINE"))
+ if (!debuginfo && seg && !strcmp(seg->name, "??LINE"))
seg = seg->next;
while (seg) {
if (seg->currentpos) {
--
2.40.0
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