File hw-scsi-megasas-check-for-NULL-frame-in-.patch of Package qemu.24555

From: Mauro Matteo Cascella <mcascell@redhat.com>
Date: Mon, 7 Mar 2022 16:22:01 +0100
Subject: hw/scsi/megasas: check for NULL frame in megasas_command_cancelled()

Git-commit: 00000000000000000000000000000000000000000000
References: bsc#1180432, CVE-2020-35503

Ensure that 'cmd->frame' is not NULL before accessing the 'header' field.
This check prevents a potential NULL pointer dereference issue.

RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1910346
Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
Reported-by: Cheolwoo Myung <cwmyung@snu.ac.kr>
Signed-off-by: Dario Faggioli <dfaggioli@suse.com>
---
 hw/scsi/megasas.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 4ff51221d4cd0952d9394b8f66b1..07b2b08bf2866907acf0a2b4450c 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -1891,7 +1891,7 @@ static void megasas_command_cancelled(SCSIRequest *req)
 {
     MegasasCmd *cmd = req->hba_private;
 
-    if (!cmd) {
+    if (!cmd || !cmd->frame) {
         return;
     }
     cmd->frame->header.cmd_status = MFI_STAT_SCSI_IO_FAILED;