qemu: Fix for CVE-2024-24474

Upstream-Status: Backport
[https://github.com/qemu/qemu/commit/77668e4b9bca03a856c27ba899a2513ddf52bb52]

Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 45 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu.inc b/meta/recipes-devtools/qemu/qemu.inc
index c5fb9b1eab..18752af274 100644
--- a/meta/recipes-devtools/qemu/qemu.inc
+++ b/meta/recipes-devtools/qemu/qemu.inc
@@ -103,6 +103,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
 	   file://CVE-2021-3638.patch \
 	   file://CVE-2023-1544.patch \
 	   file://CVE-2023-5088.patch \
+	   file://CVE-2024-24474.patch \
            "
 UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"
 
diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2024-24474.patch b/meta/recipes-devtools/qemu/qemu/CVE-2024-24474.patch
new file mode 100644
index 0000000000..e890fe56cf
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2024-24474.patch
@@ -0,0 +1,44 @@
+From 77668e4b9bca03a856c27ba899a2513ddf52bb52 Mon Sep 17 00:00:00 2001
+From: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
+Date: Wed, 13 Sep 2023 21:44:09 +0100
+Subject: [PATCH] esp: restrict non-DMA transfer length to that of available
+ data
+
+In the case where a SCSI layer transfer is incorrectly terminated, it is
+possible for a TI command to cause a SCSI buffer overflow due to the
+expected transfer data length being less than the available data in the
+FIFO. When this occurs the unsigned async_len variable underflows and
+becomes a large offset which writes past the end of the allocated SCSI
+buffer.
+
+Restrict the non-DMA transfer length to be the smallest of the expected
+transfer length and the available FIFO data to ensure that it is no longer
+possible for the SCSI buffer overflow to occur.
+
+Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
+Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1810
+Reviewed-by: Thomas Huth <thuth@redhat.com>
+Message-ID: <20230913204410.65650-3-mark.cave-ayland@ilande.co.uk>
+Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
+
+Upstream-Status: Backport [https://github.com/qemu/qemu/commit/77668e4b9bca03a856c27ba899a2513ddf52bb52]
+CVE: CVE-2024-24474
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ hw/scsi/esp.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
+index 4218a6a96054..9b11d8c5738a 100644
+--- a/hw/scsi/esp.c
++++ b/hw/scsi/esp.c
+@@ -759,7 +759,8 @@ static void esp_do_nodma(ESPState *s)
+     }
+ 
+     if (to_device) {
+-        len = MIN(fifo8_num_used(&s->fifo), ESP_FIFO_SZ);
++        len = MIN(s->async_len, ESP_FIFO_SZ);
++        len = MIN(len, fifo8_num_used(&s->fifo));
+         esp_fifo_pop_buf(&s->fifo, s->async_buf, len);
+         s->async_buf += len;
+         s->async_len -= len;