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Subject[PATCH] splice: fix bad unlock_page() in error case
Hi,

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: Jens Axboe <jens.axboe@oracle.com>

diff --git a/fs/splice.c b/fs/splice.c
index 099b831..4960085 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -628,7 +628,7 @@ find_page:
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);
@@ -684,8 +684,9 @@ find_page:
*/
mark_page_accessed(page);
out:
- page_cache_release(page);
unlock_page(page);
+out_release:
+ page_cache_release(page);
out_ret:
return ret;
}
--
Jens Axboe

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