[PATCH] media: bttv: fix use after free error due to btv->timeout timer

[Zheng Wang]

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

Signed-off-by: Zheng Wang <zyytlz.wz@xxxxxxx>
---
 drivers/media/pci/bt8xx/bttv-driver.c | 1 +
 drivers/media/pci/bt8xx/bttv-risc.c   | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/pci/bt8xx/bttv-driver.c b/drivers/media/pci/bt8xx/bttv-driver.c
index d40b537f4e98..24ba5729969d 100644
--- a/drivers/media/pci/bt8xx/bttv-driver.c
+++ b/drivers/media/pci/bt8xx/bttv-driver.c
@@ -4248,6 +4248,7 @@ 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));
diff --git a/drivers/media/pci/bt8xx/bttv-risc.c b/drivers/media/pci/bt8xx/bttv-risc.c
index 32fa4a7fe76f..ada469198645 100644
--- a/drivers/media/pci/bt8xx/bttv-risc.c
+++ b/drivers/media/pci/bt8xx/bttv-risc.c
@@ -481,7 +481,7 @@ bttv_set_dma(struct bttv *btv, int override)
 	if (btv->curr.frame_irq || btv->loop_irq || btv->cvbi) {
 		mod_timer(&btv->timeout, jiffies+BTTV_TIMEOUT);
 	} else {
-		del_timer(&btv->timeout);
+		del_timer_sync(&btv->timeout);
 	}
 	btv->main.cpu[RISC_SLOT_LOOP] = cpu_to_le32(cmd);
 
-- 
2.25.1