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Subject[PATCH v2] erofs: fix memory leak on short-lived bounced pages
Date
Both MicroLZMA and DEFLATE algorithms can use short-lived pages on
demand for overlap inplace I/O decompression.

However, those short-lived pages are actually added to
`be->compressed_pages`. Thus, it should be checked instead of
`pcl->compressed_bvecs`.

The LZ4 algorithm doesn't work like this, so it won't be impacted.

Fixes: 67139e36d970 ("erofs: introduce `z_erofs_parse_in_bvecs'")
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
---
v2:
- should be `be->compressed_pages`.

fs/erofs/zdata.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index a7e6847f6f8f..a33cd6757f98 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -1309,12 +1309,11 @@ static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be,
put_page(page);
} else {
for (i = 0; i < pclusterpages; ++i) {
- page = pcl->compressed_bvecs[i].page;
+ /* consider shortlived pages added when decompressing */
+ page = be->compressed_pages[i];

if (erofs_page_is_managed(sbi, page))
continue;
-
- /* recycle all individual short-lived pages */
(void)z_erofs_put_shortlivedpage(be->pagepool, page);
WRITE_ONCE(pcl->compressed_bvecs[i].page, NULL);
}
--
2.39.3
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