scsi: use-after-free in mptsas_process_scsi_io_request() of mptsas1068 emulator --- meta/recipes-devtools/qemu/qemu.inc | 1 + .../qemu/qemu/CVE-2021-3392.patch | 45 +++++++++++++++++++ 2 files changed, 46 insertions(+) create mode 100644 meta/recipes-devtools/qemu/qemu/CVE-2021-3392.patch
diff --git a/meta/recipes-devtools/qemu/qemu.inc b/meta/recipes-devtools/qemu/qemu.inc index 482ca3d6e5..e9a7b6fcac 100644 --- a/meta/recipes-devtools/qemu/qemu.inc +++ b/meta/recipes-devtools/qemu/qemu.inc @@ -40,6 +40,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \ file://CVE-2020-35517.patch \ file://CVE-2020-29443.patch \ file://CVE-2021-20203.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 <flower...@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 <p...@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 <cwmy...@snu.ac.kr> +Signed-off-by: Prasad J Pandit <p...@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 <flower...@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 + -- 2.24.3 (Apple Git-128)
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