From: Zheng Wang zyytlz.wz@163.com

stable inclusion from stable-v4.19.283 commit 95e684340470a95ff4957cb9a536ec7a0461c75b category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I7ERIV CVE: CVE-2023-3327

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[ Upstream commit 30cf57da176cca80f11df0d9b7f71581fe601389 ]

In saa7134_initdev, it will call saa7134_hwinit1. There are three function invoking here: saa7134_video_init1, saa7134_ts_init1 and saa7134_vbi_init1.

All of them will init a timer with same function. Take saa7134_video_init1 as an example. It'll bound &dev->video_q.timeout with saa7134_buffer_timeout.

In buffer_activate, the timer funtcion is started.

If we remove the module or device which will call saa7134_finidev to make cleanup, there may be a unfinished work. The possible sequence is as follows, which will cause a typical UAF bug.

Fix it by canceling the timer works accordingly before cleanup in saa7134_finidev.

CPU0 CPU1

|saa7134_buffer_timeout saa7134_finidev | kfree(dev); | | | saa7134_buffer_next | //use dev

Fixes: 1e7126b4a86a ("media: saa7134: Convert timers to use timer_setup()") Signed-off-by: Zheng Wang zyytlz.wz@163.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Longlong Xia xialonglong1@huawei.com Reviewed-by: Nanyong Sun sunnanyong@huawei.com Reviewed-by: Xiu Jianfeng xiujianfeng@huawei.com Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com --- drivers/media/pci/saa7134/saa7134-ts.c | 1 + drivers/media/pci/saa7134/saa7134-vbi.c | 1 + drivers/media/pci/saa7134/saa7134-video.c | 1 + 3 files changed, 3 insertions(+)

diff --git a/drivers/media/pci/saa7134/saa7134-ts.c b/drivers/media/pci/saa7134/saa7134-ts.c index 2be703617e29..e7adcd4f9962 100644 --- a/drivers/media/pci/saa7134/saa7134-ts.c +++ b/drivers/media/pci/saa7134/saa7134-ts.c @@ -309,6 +309,7 @@ int saa7134_ts_start(struct saa7134_dev *dev)

int saa7134_ts_fini(struct saa7134_dev *dev) { + del_timer_sync(&dev->ts_q.timeout); saa7134_pgtable_free(dev->pci, &dev->ts_q.pt); return 0; } diff --git a/drivers/media/pci/saa7134/saa7134-vbi.c b/drivers/media/pci/saa7134/saa7134-vbi.c index 57bea543c39b..559db500b19c 100644 --- a/drivers/media/pci/saa7134/saa7134-vbi.c +++ b/drivers/media/pci/saa7134/saa7134-vbi.c @@ -194,6 +194,7 @@ int saa7134_vbi_init1(struct saa7134_dev *dev) int saa7134_vbi_fini(struct saa7134_dev *dev) { /* nothing */ + del_timer_sync(&dev->vbi_q.timeout); return 0; }

diff --git a/drivers/media/pci/saa7134/saa7134-video.c b/drivers/media/pci/saa7134/saa7134-video.c index 1a50ec9d084f..103cbc8c1345 100644 --- a/drivers/media/pci/saa7134/saa7134-video.c +++ b/drivers/media/pci/saa7134/saa7134-video.c @@ -2213,6 +2213,7 @@ int saa7134_video_init1(struct saa7134_dev *dev)

void saa7134_video_fini(struct saa7134_dev *dev) { + del_timer_sync(&dev->video_q.timeout); /* free stuff */ vb2_queue_release(&dev->video_vbq); saa7134_pgtable_free(dev->pci, &dev->video_q.pt);