This is a note to let you know that I've just added the patch titled
erofs: fix memory leak on short-lived bounced pages
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
erofs-fix-memory-leak-on-short-lived-bounced-pages.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 405b4fcdad59838b0119c4f3302e5d1b480159b9
Author: Gao Xiang <xiang@xxxxxxxxxx>
Date: Wed Nov 29 02:04:31 2023 +0800
erofs: fix memory leak on short-lived bounced pages
[ Upstream commit 93d6fda7f926451a0fa1121b9558d75ca47e861e ]
Both MicroLZMA and DEFLATE algorithms can use short-lived pages on
demand for the overlapped 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'")
Reviewed-by: Yue Hu <huyue2@xxxxxxxxxxx>
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231128180431.4116991-1-hsiangkao@xxxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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);
}
