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Squashfs: fix failure to unlock pages on decompress error

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Direct decompression into the page cache.  If we fall back
to using an intermediate buffer (because we cannot grab all the
page cache pages) and we get a decompress fail, we forgot to
release the pages.

Reported-by: Roman Peniaev <r.peniaev@gmail.com>
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
This commit is contained in:
Phillip Lougher 2013-11-24 00:40:49 +00:00
parent ed4f381ec1
commit 6d56540950
1 changed files with 4 additions and 1 deletions
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5
fs/squashfs/file_direct.c
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@ -84,6 +84,9 @@ int squashfs_readpage_block(struct page *target_page, u64 block, int bsize)
*/
res = squashfs_read_cache(target_page, block, bsize, pages,
page);
if (res < 0)
goto mark_errored;
goto out;
}
@ -119,7 +122,7 @@ int squashfs_readpage_block(struct page *target_page, u64 block, int bsize)
* dealt with by the caller
*/
for (i = 0; i < pages; i++) {
if (page[i] == target_page)
if (page[i] == NULL || page[i] == target_page)
continue;
flush_dcache_page(page[i]);
SetPageError(page[i]);