From: Namjae Jeon linkinjeon@kernel.org
[ Upstream commit 342edb60dcda7a409430359b0cac2864bb9dfe44 ]
Smatch static checker warning: fs/ksmbd/vfs.c:1040 ksmbd_vfs_fqar_lseek() warn: no lower bound on 'length' fs/ksmbd/vfs.c:1041 ksmbd_vfs_fqar_lseek() warn: no lower bound on 'start'
Fix unexpected result that could caused from negative start and length.
Fixes: f44158485826 ("cifsd: add file operations") Reported-by: Dan Carpenter error27@gmail.com Signed-off-by: Namjae Jeon linkinjeon@kernel.org Reviewed-by: Sergey Senozhatsky senozhatsky@chromium.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ksmbd/smb2pdu.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index 3bb971831e7ce..61d12eab0be15 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -7457,13 +7457,16 @@ static int fsctl_query_allocated_ranges(struct ksmbd_work *work, u64 id, if (in_count == 0) return -EINVAL;
+ start = le64_to_cpu(qar_req->file_offset); + length = le64_to_cpu(qar_req->length); + + if (start < 0 || length < 0) + return -EINVAL; + fp = ksmbd_lookup_fd_fast(work, id); if (!fp) return -ENOENT;
- start = le64_to_cpu(qar_req->file_offset); - length = le64_to_cpu(qar_req->length); - ret = ksmbd_vfs_fqar_lseek(fp, start, length, qar_rsp, in_count, out_count); if (ret && ret != -E2BIG)