From 75a5221630fe5aa3fedba7a06be618db0f79ba1e Mon Sep 17 00:00:00 2001 From: Gao Xiang Date: Thu, 7 Sep 2023 13:05:42 +0800 Subject: erofs: fix memory leak of LZMA global compressed deduplication When stressing microLZMA EROFS images with the new global compressed deduplication feature enabled (`-Ededupe`), I found some short-lived temporary pages weren't properly released, which could slowly cause unexpected OOMs hours later. Let's fix it now (LZ4 and DEFLATE don't have this issue.) Fixes: 5c2a64252c5d ("erofs: introduce partial-referenced pclusters") Signed-off-by: Gao Xiang Link: https://lore.kernel.org/r/20230907050542.97152-1-hsiangkao@linux.alibaba.com --- fs/erofs/decompressor_lzma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'fs/erofs') diff --git a/fs/erofs/decompressor_lzma.c b/fs/erofs/decompressor_lzma.c index 73091fbe3ea4..dee10d22ada9 100644 --- a/fs/erofs/decompressor_lzma.c +++ b/fs/erofs/decompressor_lzma.c @@ -217,9 +217,12 @@ again: strm->buf.out_size = min_t(u32, outlen, PAGE_SIZE - pageofs); outlen -= strm->buf.out_size; - if (!rq->out[no] && rq->fillgaps) /* deduped */ + if (!rq->out[no] && rq->fillgaps) { /* deduped */ rq->out[no] = erofs_allocpage(pagepool, GFP_KERNEL | __GFP_NOFAIL); + set_page_private(rq->out[no], + Z_EROFS_SHORTLIVED_PAGE); + } if (rq->out[no]) strm->buf.out = kmap(rq->out[no]) + pageofs; pageofs = 0; -- cgit