diff options
| author | Daeho Jeong <daehojeong@google.com> | 2021-01-06 08:49:28 +0900 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2021-01-27 15:20:04 -0800 |
| commit | df0736d70c4fa6ed711ba103b61880fe72bb4777 (patch) | |
| tree | 6ef84771951a3c19be9495f42472d260989a3b94 /fs/f2fs | |
| parent | 7f59b277f79e8aacaa2ec7e549be6c27985c27f2 (diff) | |
f2fs: fix null page reference in redirty_blocks
By Colin's static analysis, we found out there is a null page reference
under low memory situation in redirty_blocks. I've made the page finding
loop stop immediately and return an error not to cause further memory
pressure when we run into a failure to find a page under low memory
condition.
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reported-by: Colin Ian King <colin.king@canonical.com>
Fixes: 5fdb322ff2c2 ("f2fs: add F2FS_IOC_DECOMPRESS_FILE and F2FS_IOC_COMPRESS_FILE")
Reviewed-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
| -rw-r--r-- | fs/f2fs/file.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 4e6d4b9120a8..e3a5b620b50a 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -4057,8 +4057,10 @@ 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) - ret = -ENOENT; + if (!page) { + ret = -ENOMEM; + break; + } set_page_dirty(page); f2fs_put_page(page, 1); f2fs_put_page(page, 0); |