linux-kernel - [PATCH 5.7 132/204] f2fs: compress: fix to avoid memory leak on cc->cpages

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Message-Id: <20200820091612.871866317@linuxfoundation.org>
Date:   Thu, 20 Aug 2020 11:20:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chao Yu <yuchao0@...wei.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 132/204] f2fs: compress: fix to avoid memory leak on cc->cpages

From: Chao Yu <yuchao0@...wei.com>

[ 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@...wei.com>
Fixes: 4c8ff7095bef ("f2fs: support data compression")
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/f2fs/compress.c | 2 ++
 1 file changed, 2 insertions(+)

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);
-- 
2.25.1