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blk_rq_map_user_iov: fix error override 

commit 69e0927b37 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: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Douglas Gilbert 2018-01-14 17:00:48 -05:00 committed by Greg Kroah-Hartman
parent 2c565a9538
commit 2cc50a1946
1 changed files with 2 additions and 2 deletions
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4
block/blk-map.c
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@ -126,7 +126,7 @@ 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;
@ -155,7 +155,7 @@ unmap_rq:
__blk_rq_unmap_user(bio);
fail:
rq->bio = NULL;
return -EINVAL;
return ret;
}
EXPORT_SYMBOL(blk_rq_map_user_iov);