diff options
| -rw-r--r-- | fs/cifs/smb2misc.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c index f2e6ac29a8d6..4aa7a0f07d6e 100644 --- a/fs/cifs/smb2misc.c +++ b/fs/cifs/smb2misc.c @@ -178,9 +178,24 @@ smb2_check_message(char *buf, unsigned int length) /* Windows 7 server returns 24 bytes more */ if (clc_len + 20 == len && command == SMB2_OPLOCK_BREAK_HE) return 0; - /* server can return one byte more */ + /* server can return one byte more due to implied bcc[0] */ if (clc_len == 4 + len + 1) return 0; + + /* + * MacOS server pads after SMB2.1 write response with 3 bytes + * of junk. Other servers match RFC1001 len to actual + * SMB2/SMB3 frame length (header + smb2 response specific data) + * Log the server error (once), but allow it and continue + * since the frame is parseable. + */ + if (clc_len < 4 /* RFC1001 header size */ + len) { + printk_once(KERN_WARNING + "SMB2 server sent bad RFC1001 len %d not %d\n", + len, clc_len - 4); + return 0; + } + return 1; } return 0; |