Commit 6a860c97 authored by Jens Axboe's avatar Jens Axboe Committed by Linus Torvalds

splice: fix bad unlock_page() in error case

If add_to_page_cache_lru() fails, the page will not be locked. But
splice jumps to an error path that does a page release and unlock,
causing a BUG() in unlock_page().

Fix this by adding one more label that just releases the page. This bug
was actually triggered on EL5 by gurudas pai <gurudas.pai@oracle.com>
using fio.
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9d1ca6f1
......@@ -594,7 +594,7 @@ static int pipe_to_file(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
ret = add_to_page_cache_lru(page, mapping, index,
GFP_KERNEL);
if (unlikely(ret))
goto out;
goto out_release;
}
ret = mapping->a_ops->prepare_write(file, page, offset, offset+this_len);
......@@ -650,8 +650,9 @@ static int pipe_to_file(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
*/
mark_page_accessed(page);
out:
page_cache_release(page);
unlock_page(page);
out_release:
page_cache_release(page);
out_ret:
return ret;
}
......
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