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cciss: fix cciss_revalidate panic 

If you delete a logical drive, and then run BLKRRPART (e.g. via fdisk)
on a logical drive which is "after" the deleted logical drive in the h->drv[]
array, then cciss_revalidate panics because it will access the null pointer
h->drv[x] when x hits the deleted drive.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Stephen M. Cameron 2010-12-17 09:01:37 +01:00 committed by Jens Axboe
parent 72d4cd9f38
commit 0fc13c8995
1 changed files with 2 additions and 0 deletions
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2
drivers/block/cciss.c
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@ -2834,6 +2834,8 @@ static int cciss_revalidate(struct gendisk *disk)
InquiryData_struct *inq_buff = NULL; InquiryData_struct *inq_buff = NULL;
for (logvol = 0; logvol < CISS_MAX_LUN; logvol++) { for (logvol = 0; logvol < CISS_MAX_LUN; logvol++) {
if (!h->drv[logvol])
continue
if (memcmp(h->drv[logvol]->LunID, drv->LunID, if (memcmp(h->drv[logvol]->LunID, drv->LunID,
sizeof(drv->LunID)) == 0) { sizeof(drv->LunID)) == 0) {
FOUND = 1; FOUND = 1;