diff options
Diffstat (limited to 'fs/cifs/misc.c')
| -rw-r--r-- | fs/cifs/misc.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index 8a0edd695f84..eba1de917f2a 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -420,6 +420,7 @@ int checkSMB(struct smb_hdr *smb, __u16 mid, int length) { __u32 len = smb->smb_buf_length; + __u32 clc_len; /* calculated length */ cFYI(0, ("Entering checkSMB with Length: %x, smb_buf_length: %x ", length, len)); @@ -440,20 +441,27 @@ checkSMB(struct smb_hdr *smb, __u16 mid, int length) cERROR(1, ("smb_buf_length greater than MaxBufSize")); cERROR(1, - ("bad smb detected. Illegal length. The mid=%d", + ("bad smb detected. Illegal length. mid=%d", smb->Mid)); return 1; } if (checkSMBhdr(smb, mid)) return 1; - - if ((4 + len != smbCalcSize_LE(smb)) + clc_len = smbCalcSize_LE(smb); + if ((4 + len != clc_len) || (4 + len != (unsigned int)length)) { - cERROR(1, ("smbCalcSize %x ", smbCalcSize_LE(smb))); - cERROR(1, - ("bad smb size detected. The Mid=%d", smb->Mid)); - return 1; + cERROR(1, ("Calculated size 0x%x vs actual length 0x%x", + clc_len, 4 + len)); + cERROR(1, ("bad smb size detected for Mid=%d", smb->Mid)); + /* Windows XP can return a few bytes too much, presumably + an illegal pad, at the end of byte range lock responses + so we allow for up to eight byte pad, as long as actual + received length is as long or longer than calculated length */ + if((4+len > clc_len) && (len <= clc_len + 3)) + return 0; + else + return 1; } return 0; } |