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| author |   Gao Xiang <hsiangkao@linux.alibaba.com> | 2022-09-09 10:39:48 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2022-09-20 07:59:32 +0800 |
| commit | 1dd73601a1cba37a0ed5f89a8662c90191df5873 (patch) | |
| tree | 657be8bb59e31a87bdbe5abbcfedd78c0c8c6eff /fs/erofs/inode.c | |
| parent | Linux 6.0-rc5 (diff) | |
| download | wireguard-linux-1dd73601a1cba37a0ed5f89a8662c90191df5873.tar.xz wireguard-linux-1dd73601a1cba37a0ed5f89a8662c90191df5873.zip | |
erofs: fix order >= MAX_ORDER warning due to crafted negative i_size
As syzbot reported [1], the root cause is that i_size field is a
signed type, and negative i_size is also less than EROFS_BLKSIZ.
As a consequence, it's handled as fast symlink unexpectedly.
Let's fall back to the generic path to deal with such unusual i_size.
[1] https://lore.kernel.org/r/000000000000ac8efa05e7feaa1f@google.com
Reported-by: syzbot+f966c13b1b4fc0403b19@syzkaller.appspotmail.com
Fixes: 431339ba9042 ("staging: erofs: add inode operations")
Reviewed-by: Yue Hu <huyue2@coolpad.com>
Link: https://lore.kernel.org/r/20220909023948.28925-1-hsiangkao@linux.alibaba.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs/inode.c')
| -rw-r--r-- | fs/erofs/inode.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c index 95a403720e8c..16cf9a283557 100644 --- a/fs/erofs/inode.c +++ b/fs/erofs/inode.c @@ -214,7 +214,7 @@ static int erofs_fill_symlink(struct inode *inode, void *kaddr, /* if it cannot be handled with fast symlink scheme */ if (vi->datalayout != EROFS_INODE_FLAT_INLINE || - inode->i_size >= EROFS_BLKSIZ) { + inode->i_size >= EROFS_BLKSIZ || inode->i_size < 0) { inode->i_op = &erofs_symlink_iops; return 0; } |