From: Chao Yu <yuchao0@huawei.com>
Date: Mon, 20 Jul 2020 08:52:50 +0000 (+0800)
Subject: f2fs: compress: fix to avoid memory leak on cc->cpages
X-Git-Tag: v5.7.17~72
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f1c3c5b78c3e3f9cd5c9816b0e5518e55a37fd64;p=thirdparty%2Fkernel%2Fstable.git

f2fs: compress: fix to avoid memory leak on cc->cpages

[ Upstream commit 02772fbfcba8597eef9d5c5f7f94087132d0c1d4 ]

Memory allocated for storing compressed pages' poitner should be
released after f2fs_write_compressed_pages(), otherwise it will
cause memory leak issue.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Fixes: 4c8ff7095bef ("f2fs: support data compression")
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index a5b2e72174bb1..527d50edcb956 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -1250,6 +1250,8 @@ int f2fs_write_multi_pages(struct compress_ctx *cc,
 		err = f2fs_write_compressed_pages(cc, submitted,
 							wbc, io_type);
 		cops->destroy_compress_ctx(cc);
+		kfree(cc->cpages);
+		cc->cpages = NULL;
 		if (!err)
 			return 0;
 		f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);