From b4789b8e6be3151a955ade74872822f30e8cd914 Mon Sep 17 00:00:00 2001 From: Mahesh Rajashekhara Date: Thu, 31 Oct 2013 14:01:02 +0530 Subject: [PATCH] aacraid: prevent invalid pointer dereference It appears that driver runs into a problem here if fibsize is too small because we allocate user_srbcmd with fibsize size only but later we access it until user_srbcmd->sg.count to copy it over to srbcmd. It is not correct to test (fibsize < sizeof(*user_srbcmd)) because this structure already includes one sg element and this is not needed for commands without data. So, we would recommend to add the following (instead of test for fibsize == 0). Signed-off-by: Mahesh Rajashekhara Reported-by: Nico Golde Reported-by: Fabian Yamaguchi Signed-off-by: Linus Torvalds --- drivers/scsi/aacraid/commctrl.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c index d85ac1a9d2c0..fbcd48d0bfc3 100644 --- a/drivers/scsi/aacraid/commctrl.c +++ b/drivers/scsi/aacraid/commctrl.c @@ -511,7 +511,8 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg) goto cleanup; } - if (fibsize > (dev->max_fib_size - sizeof(struct aac_fibhdr))) { + if ((fibsize < (sizeof(struct user_aac_srb) - sizeof(struct user_sgentry))) || + (fibsize > (dev->max_fib_size - sizeof(struct aac_fibhdr)))) { rcode = -EINVAL; goto cleanup; } -- 2.20.1