1 files changed, 26 insertions, 20 deletions

diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 432ba15e2c2d..fafd056426e4 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -72,10 +72,9 @@ sesInfoAlloc(void)
         struct cifsSesInfo *ret_buf;
 
         ret_buf =
-            (struct cifsSesInfo *) kmalloc(sizeof (struct cifsSesInfo),
+            (struct cifsSesInfo *) kzalloc(sizeof (struct cifsSesInfo),
                                            GFP_KERNEL);
         if (ret_buf) {
-                memset(ret_buf, 0, sizeof (struct cifsSesInfo));
                 write_lock(&GlobalSMBSeslock);
                 atomic_inc(&sesInfoAllocCount);
                 ret_buf->status = CifsNew;
@@ -110,10 +109,9 @@ tconInfoAlloc(void)
 {
         struct cifsTconInfo *ret_buf;
         ret_buf =
-            (struct cifsTconInfo *) kmalloc(sizeof (struct cifsTconInfo),
+            (struct cifsTconInfo *) kzalloc(sizeof (struct cifsTconInfo),
                                             GFP_KERNEL);
         if (ret_buf) {
-                memset(ret_buf, 0, sizeof (struct cifsTconInfo));
                 write_lock(&GlobalSMBSeslock);
                 atomic_inc(&tconInfoAllocCount);
                 list_add(&ret_buf->cifsConnectionList,
@@ -423,9 +421,7 @@ 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));
+        cFYI(0, ("checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len));
         if (((unsigned int)length < 2 + sizeof (struct smb_hdr)) ||
             (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)) {
                 if ((unsigned int)length < 2 + sizeof (struct smb_hdr)) {
@@ -433,29 +429,36 @@ checkSMB(struct smb_hdr *smb, __u16 mid, int length)
                                 sizeof (struct smb_hdr) - 1)
                             && (smb->Status.CifsError != 0)) {
                                 smb->WordCount = 0;
-                                return 0;       /* some error cases do not return wct and bcc */
+                                /* some error cases do not return wct and bcc */
+                                return 0;
                         } else {
                                 cERROR(1, ("Length less than smb header size"));
                         }
-
                 }
                 if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)
-                        cERROR(1,
-                               ("smb_buf_length greater than MaxBufSize"));
-                cERROR(1,
-                       ("bad smb detected. Illegal length. mid=%d",
-                        smb->Mid));
+                        cERROR(1, ("smb length greater than MaxBufSize, mid=%d",
+                                   smb->Mid));
                 return 1;
         }
 
         if (checkSMBhdr(smb, mid))
                 return 1;
         clc_len = smbCalcSize_LE(smb);
-        if ((4 + len != clc_len)
-            || (4 + len != (unsigned int)length)) {
-                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));
+
+        if(4 + len != (unsigned int)length) {
+                cERROR(1, ("Length read does not match RFC1001 length %d",len));
+                return 1;
+        }
+
+        if (4 + len != clc_len) {
+                /* check if bcc wrapped around for large read responses */
+                if((len > 64 * 1024) && (len > clc_len)) {
+                        /* check if lengths match mod 64K */
+                        if(((4 + len) & 0xFFFF) == (clc_len & 0xFFFF))
+                                return 0; /* bcc wrapped */                     
+                }
+                cFYI(1, ("Calculated size %d vs length %d mismatch for mid %d",
+                                clc_len, 4 + len, 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 that three byte pad, as long as actual
@@ -469,8 +472,11 @@ checkSMB(struct smb_hdr *smb, __u16 mid, int length)
                 wct and bcc to minimum size and drop the t2 parms and data */
                 if((4+len > clc_len) && (len <= clc_len + 512))
                         return 0;
-                else
+                else {
+                        cERROR(1, ("RFC1001 size %d bigger than SMB for Mid=%d",
+                                        len, smb->Mid));
                         return 1;
+                }
         }
         return 0;
 }