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| author |   ZhangPeng <zhangpeng362@huawei.com> | 2022-12-07 09:46:10 +0000 |
|---|---|---|
| committer |   Konstantin Komarov <almaz.alexandrovich@paragon-software.com> | 2023-03-27 16:59:10 +0400 |
| commit | b8c44949044e5f7f864525fdffe8e95135ce9ce5 (patch) | |
| tree | 8a6c55d3b8a229118d3b8193a36a126731d0b141 /fs/ntfs3/index.c | |
| parent | fs/ntfs3: Fix NULL pointer dereference in 'ni_write_inode' (diff) | |
| download | wireguard-linux-b8c44949044e5f7f864525fdffe8e95135ce9ce5.tar.xz wireguard-linux-b8c44949044e5f7f864525fdffe8e95135ce9ce5.zip | |
fs/ntfs3: Fix OOB read in indx_insert_into_buffer
Syzbot reported a OOB read bug:
BUG: KASAN: slab-out-of-bounds in indx_insert_into_buffer+0xaa3/0x13b0
fs/ntfs3/index.c:1755
Read of size 17168 at addr ffff8880255e06c0 by task syz-executor308/3630
Call Trace:
<TASK>
memmove+0x25/0x60 mm/kasan/shadow.c:54
indx_insert_into_buffer+0xaa3/0x13b0 fs/ntfs3/index.c:1755
indx_insert_entry+0x446/0x6b0 fs/ntfs3/index.c:1863
ntfs_create_inode+0x1d3f/0x35c0 fs/ntfs3/inode.c:1548
ntfs_create+0x3e/0x60 fs/ntfs3/namei.c:100
lookup_open fs/namei.c:3413 [inline]
If the member struct INDEX_BUFFER *index of struct indx_node is
incorrect, that is, the value of __le32 used is greater than the value
of __le32 total in struct INDEX_HDR. Therefore, OOB read occurs when
memmove is called in indx_insert_into_buffer().
Fix this by adding a check in hdr_find_e().
Fixes: 82cae269cfa9 ("fs/ntfs3: Add initialization of super block")
Reported-by: syzbot+d882d57193079e379309@syzkaller.appspotmail.com
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Diffstat (limited to 'fs/ntfs3/index.c')
| -rw-r--r-- | fs/ntfs3/index.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ntfs3/index.c b/fs/ntfs3/index.c index 51ab75954640..ae9616becec1 100644 --- a/fs/ntfs3/index.c +++ b/fs/ntfs3/index.c @@ -725,9 +725,13 @@ static struct NTFS_DE *hdr_find_e(const struct ntfs_index *indx, u32 e_size, e_key_len; u32 end = le32_to_cpu(hdr->used); u32 off = le32_to_cpu(hdr->de_off); + u32 total = le32_to_cpu(hdr->total); u16 offs[128]; fill_table: + if (end > total) + return NULL; + if (off + sizeof(struct NTFS_DE) > end) return NULL; |