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| author | Mahesh Rajashekhara <Mahesh.Rajashekhara@pmcs.com> | 2013-10-31 14:01:02 +0530 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2014-01-03 04:33:35 +0000 |
| commit | 1016f060cfaf7c575fce3a92c987d21202da3261 (patch) | |
| tree | e82bc32877d29a3f4fad664407ceabc77c7965e9 /drivers/scsi | |
| parent | e3715d06207f877ac6c15b2627515f63e2c59f57 (diff) | |
| download | kernel_samsung_smdk4412-1016f060cfaf7c575fce3a92c987d21202da3261.zip kernel_samsung_smdk4412-1016f060cfaf7c575fce3a92c987d21202da3261.tar.gz kernel_samsung_smdk4412-1016f060cfaf7c575fce3a92c987d21202da3261.tar.bz2 | |
aacraid: prevent invalid pointer dereference
commit b4789b8e6be3151a955ade74872822f30e8cd914 upstream.
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 <Mahesh.Rajashekhara@pmcs.com>
Reported-by: Nico Golde <nico@ngolde.de>
Reported-by: Fabian Yamaguchi <fabs@goesec.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/aacraid/commctrl.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c index 8a0b330..1254431 100644 --- a/drivers/scsi/aacraid/commctrl.c +++ b/drivers/scsi/aacraid/commctrl.c @@ -508,7 +508,8 @@ 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; } |