From 342edb60dcda7a409430359b0cac2864bb9dfe44 Mon Sep 17 00:00:00 2001 From: Namjae Jeon Date: Tue, 7 Mar 2023 21:56:07 +0900 Subject: [PATCH] ksmbd: add low bound validation to FSCTL_QUERY_ALLOCATED_RANGES 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 Signed-off-by: Namjae Jeon Reviewed-by: Sergey Senozhatsky Signed-off-by: Steve French --- 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 f09afbdde58a..cb779d217234 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -7448,13 +7448,16 @@ 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)