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Date: Tue, 5 Jan 2021 10:28:26 +0900 From: Daeho Jeong <daeho43@...il.com> To: linux-kernel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com Cc: Daeho Jeong <daehojeong@...gle.com>, Colin Ian King <colin.king@...onical.com> Subject: [PATCH] f2fs: fix null page reference in redirty_blocks From: Daeho Jeong <daehojeong@...gle.com> Fixed null page reference when find_lock_page() fails in redirty_blocks(). Signed-off-by: Daeho Jeong <daehojeong@...gle.com> Reported-by: Colin Ian King <colin.king@...onical.com> Fixes: 5fdb322ff2c2 ("f2fs: add F2FS_IOC_DECOMPRESS_FILE and F2FS_IOC_COMPRESS_FILE") --- fs/f2fs/file.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 9e5275716be8..bf6682a52433 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -4060,8 +4060,10 @@ static int redirty_blocks(struct inode *inode, pgoff_t page_idx, int len) for (i = 0; i < page_len; i++, redirty_idx++) { page = find_lock_page(mapping, redirty_idx); - if (!page) + if (!page) { ret = -ENOENT; + continue; + } set_page_dirty(page); f2fs_put_page(page, 1); f2fs_put_page(page, 0); -- 2.29.2.729.g45daf8777d-goog
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