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Subject: media: bttv: fix use after free error due to btv->timeout timer
Author: Zheng Wang <zyytlz...@163.com>
Date: Thu Apr 13 11:49:42 2023 +0800
There may be some a race condition between timer function
bttv_irq_timeout and bttv_remove. The timer is setup in
probe and there is no timer_delete operation in remove
function. When it hit kfree btv, the function might still be
invoked, which will cause use after free bug.
This bug is found by static analysis, it may be false positive.
Fix it by adding del_timer_sync invoking to the remove function.
cpu0 cpu1
bttv_probe
->timer_setup
->bttv_set_dma
->mod_timer;
bttv_remove
->kfree(btv);
->bttv_irq_timeout
->USE btv
Fixes: 162e6376ac58 ("media: pci: Convert timers to use timer_setup()")
Signed-off-by: Zheng Wang <zyytlz...@163.com>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
drivers/media/pci/bt8xx/bttv-driver.c | 1 +
1 file changed, 1 insertion(+)
---
diff --git a/drivers/media/pci/bt8xx/bttv-driver.c
b/drivers/media/pci/bt8xx/bttv-driver.c
index aa708a0e5eac..09a193bb87df 100644
--- a/drivers/media/pci/bt8xx/bttv-driver.c
+++ b/drivers/media/pci/bt8xx/bttv-driver.c
@@ -3474,6 +3474,7 @@ static void bttv_remove(struct pci_dev *pci_dev)
/* free resources */
free_irq(btv->c.pci->irq,btv);
+ del_timer_sync(&btv->timeout);
iounmap(btv->bt848_mmio);
release_mem_region(pci_resource_start(btv->c.pci,0),
pci_resource_len(btv->c.pci,0));
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