[PATCH -stable] cifs: make sure we allocate enough storage for socket address

[Jeff Layton]

cifs_mount declares a struct sockaddr on the stack and then casts it
to the proper address type. The storage allocated is fine for ipv4,
but is too small for ipv6 addresses. Declare it as
"struct sockaddr_storage" instead of struct sockaddr".

This bug was manifesting itself as oopses and address corruption when
mounting IPv6 addresses.

Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
Tested-by: Stefan Bader <stefan.bader@xxxxxxxxxxxxx>
---
 fs/cifs/connect.c |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 223647f..f254235 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1349,7 +1349,7 @@ cifs_parse_mount_options(char *options, const char *devname,
 }
 
 static struct TCP_Server_Info *
-cifs_find_tcp_session(struct sockaddr *addr)
+cifs_find_tcp_session(struct sockaddr_storage *addr)
 {
 	struct list_head *tmp;
 	struct TCP_Server_Info *server;
@@ -1369,11 +1369,11 @@ cifs_find_tcp_session(struct sockaddr *addr)
 		if (server->tcpStatus == CifsNew)
 			continue;
 
-		if (addr->sa_family == AF_INET &&
+		if (addr->ss_family == AF_INET &&
 		    (addr4->sin_addr.s_addr !=
 		     server->addr.sockAddr.sin_addr.s_addr))
 			continue;
-		else if (addr->sa_family == AF_INET6 &&
+		else if (addr->ss_family == AF_INET6 &&
 			 memcmp(&server->addr.sockAddr6.sin6_addr,
 				&addr6->sin6_addr, sizeof(addr6->sin6_addr)))
 			continue;
@@ -2027,7 +2027,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 	int rc = 0;
 	int xid;
 	struct socket *csocket = NULL;
-	struct sockaddr addr;
+	struct sockaddr_storage addr;
 	struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
 	struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
 	struct smb_vol volume_info;
@@ -2039,7 +2039,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 
 /* cFYI(1, ("Entering cifs_mount. Xid: %d with: %s", xid, mount_data)); */
 
-	memset(&addr, 0, sizeof(struct sockaddr));
+	memset(&addr, 0, sizeof(struct sockaddr_storage));
 	memset(&volume_info, 0, sizeof(struct smb_vol));
 	if (cifs_parse_mount_options(mount_data, devname, &volume_info)) {
 		rc = -EINVAL;
@@ -2069,9 +2069,9 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			rc = cifs_inet_pton(AF_INET6, volume_info.UNCip,
 					    &sin_server6->sin6_addr.in6_u);
 			if (rc > 0)
-				addr.sa_family = AF_INET6;
+				addr.ss_family = AF_INET6;
 		} else {
-			addr.sa_family = AF_INET;
+			addr.ss_family = AF_INET;
 		}
 
 		if (rc <= 0) {
@@ -2113,7 +2113,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 
 	srvTcp = cifs_find_tcp_session(&addr);
 	if (!srvTcp) { /* create socket */
-		if (addr.sa_family == AF_INET6) {
+		if (addr.ss_family == AF_INET6) {
 			cFYI(1, ("attempting ipv6 connect"));
 			/* BB should we allow ipv6 on port 139? */
 			/* other OS never observed in Wild doing 139 with v6 */
@@ -2144,7 +2144,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 		} else {
 			srvTcp->noblocksnd = volume_info.noblocksnd;
 			srvTcp->noautotune = volume_info.noautotune;
-			if (addr.sa_family == AF_INET6)
+			if (addr.ss_family == AF_INET6)
 				memcpy(&srvTcp->addr.sockAddr6, sin_server6,
 					sizeof(struct sockaddr_in6));
 			else
-- 
1.5.5.6

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