[PATCH] staging: rts5208: add check on NULL before dereference

Anton Vasilyev
2018-06-09T16:44:20Z

If rtsx_probe fails to allocate dev->chip, then NULL pointer
dereference occurs at rtsx_release_resources().

Patch adds checks chip on NULL before its dereference at
rtsx_release_resources and passing with dereference inside
rtsx_release_chip.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru>
---
drivers/staging/rts5208/rtsx.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/rts5208/rtsx.c b/drivers/staging/rts5208/rtsx.c
index 70e0b8623110..952dd0d580cf 100644
--- a/drivers/staging/rts5208/rtsx.c
+++ b/drivers/staging/rts5208/rtsx.c
@@ -623,12 +623,13 @@ static void rtsx_release_resources(struct rtsx_dev *dev)

if (dev->irq > 0)
free_irq(dev->irq, (void *)dev);
- if (dev->chip->msi_en)
+ if (dev->chip && dev->chip->msi_en)
pci_disable_msi(dev->pci);
if (dev->remap_addr)
iounmap(dev->remap_addr);
+ if (dev->chip)
+ rtsx_release_chip(dev->chip);

- rtsx_release_chip(dev->chip);
kfree(dev->chip);
}

--
2.17.1