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[CIFS] Fix large (ie over 64K for MaxCIFSBufSize) buffer case for wrapping 

bcc on read response and for wrapping sessionsetup maxbufsize field

Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2006-02-24 06:15:11 +00:00
parent 5d2f248a5f
commit 184ed2110a
3 changed files with 24 additions and 13 deletions
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6
fs/cifs/CHANGES
View File

@ -2,7 +2,11 @@ Version 1.41
------------
Fix NTLMv2 security (can be enabled in /proc/fs/cifs) so customers can
configure stronger authentication. Fix sfu symlinks so they can
be followed (not just recognized).
be followed (not just recognized). Fix wraparound of bcc on
read responses when buffer size over 64K and also fix wrap of
max smb buffer size when CIFSMaxBufSize over 64K. Fix oops in
cifs_user_read and cifs_readpages (when EAGAIN on send of smb
on socket is returned over and over)
Version 1.40
------------

4
fs/cifs/connect.c
View File

@ -564,7 +564,7 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server)
dump_smb(smb_buffer, length);
if (checkSMB (smb_buffer, smb_buffer->Mid, total_read+4)) {
if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
continue;
}
@ -2278,6 +2278,8 @@ CIFSSpnegoSessSetup(unsigned int xid, struct cifsSesInfo *ses,
smb_buffer->Mid = GetNextMid(ses->server);
pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
pSMB->req.AndXCommand = 0xFF;
if(ses->server->maxBuf > 64*1024)
ses->server->maxBuf = (64*1023);
pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);

27
fs/cifs/misc.c
View File

@ -421,9 +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)) {
@ -435,22 +433,29 @@ checkSMB(struct smb_hdr *smb, __u16 mid, int length)
} 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)) {
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 */
}
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));