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| author | Yue Hu <huyue2@coolpad.com> | 2022-10-21 16:53:25 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2022-11-08 14:44:13 +0800 |
| commit | e5126de138caef0eedb3d6431059c0c5581a1a5d (patch) | |
| tree | e0b57c7ab5e71c75bc2b47984829c948a6baded2 /fs | |
| parent | f0c4d9fc9cc9462659728d168387191387e903cc (diff) | |
| download | linux-stable-e5126de138caef0eedb3d6431059c0c5581a1a5d.tar.gz linux-stable-e5126de138caef0eedb3d6431059c0c5581a1a5d.tar.bz2 linux-stable-e5126de138caef0eedb3d6431059c0c5581a1a5d.zip | |
erofs: fix general protection fault when reading fragment
As syzbot reported [1], the fragment feature sb flag is not set, so
packed_inode != NULL needs to be checked in z_erofs_read_fragment().
[1] https://lore.kernel.org/all/0000000000002e7a8905eb841ddd@google.com/
Reported-by: syzbot+3faecbfd845a895c04cb@syzkaller.appspotmail.com
Fixes: b15b2e307c3a ("erofs: support on-disk compressed fragments data")
Signed-off-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20221021085325.25788-1-zbestahu@gmail.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/erofs/zdata.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index c7f24fc7efd5..d6caf275be77 100644 --- a/fs/erofs/zdata.c +++ b/fs/erofs/zdata.c @@ -660,6 +660,9 @@ static int z_erofs_read_fragment(struct inode *inode, erofs_off_t pos, u8 *src, *dst; unsigned int i, cnt; + if (!packed_inode) + return -EFSCORRUPTED; + pos += EROFS_I(inode)->z_fragmentoff; for (i = 0; i < len; i += cnt) { cnt = min_t(unsigned int, len - i, |