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cifs: prevent possible memory corruption in cifs_demultiplex_thread

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cifs_demultiplex_thread sets the addr.sockAddr.sin_port without any
regard for the socket family. While it may be that the error in question
here never occurs on an IPv6 socket, it's probably best to be safe and
set the port properly if it ever does.

Break the port setting code out of cifs_fill_sockaddr and into a new
function, and call that from cifs_demultiplex_thread.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2010-09-03 12:00:50 -04:00 committed by Steve French
parent 7332f2a621
commit 32670396e7
3 changed files with 21 additions and 15 deletions
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3
fs/cifs/cifsproto.h
View File

@ -87,8 +87,9 @@ extern unsigned int smbCalcSize_LE(struct smb_hdr *ptr);
extern int decode_negTokenInit(unsigned char *security_blob, int length,
struct TCP_Server_Info *server);
extern int cifs_convert_address(struct sockaddr *dst, const char *src, int len);
extern int cifs_set_port(struct sockaddr *addr, const unsigned short int port);
extern int cifs_fill_sockaddr(struct sockaddr *dst, const char *src, int len,
unsigned short int port);
const unsigned short int port);
extern int map_smb_to_linux_error(struct smb_hdr *smb, int logErr);
extern void header_assemble(struct smb_hdr *, char /* command */ ,
const struct cifsTconInfo *, int /* length of

3
fs/cifs/connect.c
View File

@ -463,7 +463,8 @@ incomplete_rcv:
* is since we do not begin with RFC1001 session
* initialize frame)
*/
server->addr.sockAddr.sin_port = htons(CIFS_PORT);
cifs_set_port((struct sockaddr *)
&server->addr.sockAddr, CIFS_PORT);
cifs_reconnect(server);
csocket = server->ssocket;
wake_up(&server->response_q);

30
fs/cifs/netmisc.c
View File

@ -205,25 +205,29 @@ cifs_convert_address(struct sockaddr *dst, const char *src, int len)
return rc;
}
int
cifs_set_port(struct sockaddr *addr, const unsigned short int port)
{
switch (addr->sa_family) {
case AF_INET:
((struct sockaddr_in *)addr)->sin_port = htons(port);
break;
case AF_INET6:
((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
break;
default:
return 0;
}
return 1;
}
int
cifs_fill_sockaddr(struct sockaddr *dst, const char *src, int len,
const unsigned short int port)
{
if (!cifs_convert_address(dst, src, len))
return 0;
switch (dst->sa_family) {
case AF_INET:
((struct sockaddr_in *)dst)->sin_port = htons(port);
break;
case AF_INET6:
((struct sockaddr_in6 *)dst)->sin6_port = htons(port);
break;
default:
return 0;
}
return 1;
return cifs_set_port(dst, port);
}
/*****************************************************************************