Commit 61a111c6 authored by Dikshita Agarwal's avatar Dikshita Agarwal Committed by Xia Fukun
Browse files

media: venus: fix use after free in vdec_close 

stable inclusion
from stable-v4.19.320
commit ad8cf035baf29467158e0550c7a42b7bb43d1db6
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAKQ1L
CVE: CVE-2024-42313

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.19.y&id=ad8cf035baf29467158e0550c7a42b7bb43d1db6



--------------------------------

commit a0157b5aa34eb43ec4c5510f9c260bbb03be937e upstream.

There appears to be a possible use after free with vdec_close().
The firmware will add buffer release work to the work queue through
HFI callbacks as a normal part of decoding. Randomly closing the
decoder device from userspace during normal decoding can incur
a read after free for inst.

Fix it by cancelling the work in vdec_close.

Cc: stable@vger.kernel.org
Fixes: af2c3834 ("[media] media: venus: adding core part and helper functions")
Signed-off-by: default avatarDikshita Agarwal <quic_dikshita@quicinc.com>
Acked-by: default avatarVikash Garodia <quic_vgarodia@quicinc.com>
Signed-off-by: default avatarStanimir Varbanov <stanimir.k.varbanov@gmail.com>
Signed-off-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarXia Fukun <xiafukun@huawei.com>
parent 65d25ca2

drivers/media/platform/qcom/venus/vdec.c

+1 −0
Original line number Diff line number Diff line
@@ -1094,6 +1094,7 @@ static int vdec_close(struct file *file) 
{

	struct venus_inst *inst = to_inst(file);



	cancel_work_sync(&inst->delayed_process_work);

	v4l2_m2m_ctx_release(inst->m2m_ctx);

	v4l2_m2m_release(inst->m2m_dev);

	vdec_ctrl_deinit(inst);