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bsg: fix potential error pointer dereference 

Dan writes:

block/bsg.c:327 bsg_map_hdr() error: 'next_rq' dereferencing possible
ERR_PTR().

Fix this by setting next_rq to NULL, for the case where it can be
!= NULL but an error pointer.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2014-08-28 15:05:40 -06:00
parent a492f07545
commit 55872c5a3c
1 changed files with 1 additions and 0 deletions
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block/bsg.c
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@ -287,6 +287,7 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm,
next_rq = blk_get_request(q, READ, GFP_KERNEL); next_rq = blk_get_request(q, READ, GFP_KERNEL);
if (IS_ERR(next_rq)) { if (IS_ERR(next_rq)) {
ret = PTR_ERR(next_rq); ret = PTR_ERR(next_rq);
next_rq = NULL;
goto out; goto out;
} }
rq->next_rq = next_rq; rq->next_rq = next_rq;