[04/13] ide: Potential null pointer dereference in ide_cdrom_reset()

Submitted by Marina Makienko on Aug. 9, 2012, 1:55 p.m.


Message ID 1344520529-19164-2-git-send-email-makienko@ispras.ru
State Rejected
Delegated to: David Miller
Headers show

Commit Message

Marina Makienko Aug. 9, 2012, 1:55 p.m.
The function blk_get_request() can return NULL in some cases. There are
checks on it if function is called with argumetns one of which is
GFP_ATOMIC/GFP_NOIO/etc. If system couldn't find request
blk_get_request() return NULL.

But if there is function call with argument __GFP_WAIT
the system will wait until get request or the queue becomes
dead. If something kills the queue, blk_get_request()
return NULL and next operations will lead to errors.

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

Signed-off-by: Marina Makienko <makienko@ispras.ru>
 drivers/ide/ide-cd_ioctl.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

Patch hide | download patch | download mbox

diff --git a/drivers/ide/ide-cd_ioctl.c b/drivers/ide/ide-cd_ioctl.c
index 02caa7d..e29588f 100644
--- a/drivers/ide/ide-cd_ioctl.c
+++ b/drivers/ide/ide-cd_ioctl.c
@@ -304,6 +304,10 @@  int ide_cdrom_reset(struct cdrom_device_info *cdi)
 	int ret;
 	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
+	if (!rq)
+		return -EIO;
 	rq->cmd_type = REQ_TYPE_SPECIAL;
 	rq->cmd_flags = REQ_QUIET;
 	ret = blk_execute_rq(drive->queue, cd->disk, rq, 0);