Commit 7abb5e9d authored by Douglas Gilbert's avatar Douglas Gilbert Committed by Greg Kroah-Hartman

blk_rq_map_user_iov: fix error override

commit 69e0927b upstream.

During stress tests by syzkaller on the sg driver the block layer
infrequently returns EINVAL. Closer inspection shows the block
layer was trying to return ENOMEM (which is much more
understandable) but for some reason overroad that useful error.

Patch below does not show this (unchanged) line:
   ret =__blk_rq_map_user_iov(rq, map_data, &i, gfp_mask, copy);
That 'ret' was being overridden when that function failed.
Signed-off-by: default avatarDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3ee287d3
No related merge requests found
......@@ -116,7 +116,7 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
unsigned long align = q->dma_pad_mask | queue_dma_alignment(q);
struct bio *bio = NULL;
struct iov_iter i;
int ret;
int ret = -EINVAL;
if (!iter_is_iovec(iter))
goto fail;
......@@ -145,7 +145,7 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
__blk_rq_unmap_user(bio);
fail:
rq->bio = NULL;
return -EINVAL;
return ret;
}
EXPORT_SYMBOL(blk_rq_map_user_iov);
......
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