qemu: fix CVE-2021-3392

scsi: use-after-free in mptsas_process_scsi_io_request() of mptsas1068 emulator
(From OE-Core rev: 97ec10a1d7111dafde8609176ffa9e13cc1b8f1f)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 46 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu.inc b/meta/recipes-devtools/qemu/qemu.inc
index 46b784241e..062d7907cf 100644
--- a/meta/recipes-devtools/qemu/qemu.inc
+++ b/meta/recipes-devtools/qemu/qemu.inc
@@ -54,6 +54,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
            file://CVE-2021-3416_9.patch \
            file://CVE-2021-3416_10.patch \
            file://CVE-2021-20257.patch \
+           file://CVE-2021-3392.patch \
            "
 UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"
 
diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2021-3392.patch b/meta/recipes-devtools/qemu/qemu/CVE-2021-3392.patch
new file mode 100644
index 0000000000..1c688827db
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2021-3392.patch
@@ -0,0 +1,45 @@
+From 3431b01b43584de5f710c40605fe3251f81c0e11 Mon Sep 17 00:00:00 2001
+From: Minjae Kim <flowergom@gmail.com>
+Date: Tue, 27 Apr 2021 02:09:49 +0000
+Subject: [PATCH] scsi: mptsas: dequeue request object in case of an error
+ (CVE-2021-3392)
+
+From: Prasad J Pandit <pjp@fedoraproject.org>
+
+While processing SCSI i/o requests in mptsas_process_scsi_io_request(),
+the Megaraid emulator appends new MPTSASRequest object 'req' to
+the 's->pending' queue. In case of an error, this same object gets
+dequeued in mptsas_free_request() only if SCSIRequest object
+'req->sreq' is initialised. This may lead to a use-after-free issue.
+Unconditionally dequeue 'req' object from 's->pending' to avoid it.
+
+Fixes: CVE-2021-3392
+Buglink: https://bugs.launchpad.net/qemu/+bug/1914236
+Reported-by: Cheolwoo Myung <cwmyung@snu.ac.kr>
+Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
+
+Upstream-Status: Acepted
+[https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg00488.html]
+CVE: CVE-2021-3392
+Signed-off-by: Minjae Kim <flowergom@gmail.com>
+---
+ hw/scsi/mptsas.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/hw/scsi/mptsas.c b/hw/scsi/mptsas.c
+index f86616544..adff5b0bf 100644
+--- a/hw/scsi/mptsas.c
++++ b/hw/scsi/mptsas.c
+@@ -257,8 +257,8 @@ static void mptsas_free_request(MPTSASRequest *req)
+         req->sreq->hba_private = NULL;
+         scsi_req_unref(req->sreq);
+         req->sreq = NULL;
+-        QTAILQ_REMOVE(&s->pending, req, next);
+     }
++    QTAILQ_REMOVE(&s->pending, req, next);
+     qemu_sglist_destroy(&req->qsg);
+     g_free(req);
+ }
+-- 
+2.17.1
+