cifs: sanitize length checking in coalesce_t2 (try #3)

BugLink: http://bugs.launchpad.net/bugs/788691

commit 2a2047bc94d0efc316401170c3d078d9edc20dc4 upstream.

There are a couple of places in this code where these values can wrap or
go negative, and that could potentially end up overflowing the buffer.
Ensure that that doesn't happen. Do all of the length calculation and
checks first, and only perform the memcpy after they pass.

Also, increase some stack variables to 32 bits to ensure that they don't
wrap without being detected.

Finally, change the error codes to be a bit more descriptive of any
problems detected. -EINVAL isn't very accurate.

Reported-and-Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Steve Conklin <sconklin@canonical.com>

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index d3d836d..d3433fc 100644 (file)
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -275,7 +275,8 @@ static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
        char *data_area_of_target;
        char *data_area_of_buf2;
        int remaining;
-       __u16 byte_count, total_data_size, total_in_buf, total_in_buf2;
+       unsigned int byte_count, total_in_buf;
+       __u16 total_data_size, total_in_buf2;
 
        total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
 
@@ -288,7 +289,7 @@ static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
        remaining = total_data_size - total_in_buf;
 
        if (remaining < 0)
-               return -EINVAL;
+               return -EPROTO;
 
        if (remaining == 0) /* nothing to do, ignore */
                return 0;
@@ -309,20 +310,29 @@ static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
        data_area_of_target += total_in_buf;
 
        /* copy second buffer into end of first buffer */
-       memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
        total_in_buf += total_in_buf2;
+       /* is the result too big for the field? */
+       if (total_in_buf > USHRT_MAX)
+               return -EPROTO;
        put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);
+
+       /* fix up the BCC */
        byte_count = get_bcc_le(pTargetSMB);
        byte_count += total_in_buf2;
+       /* is the result too big for the field? */
+       if (byte_count > USHRT_MAX)
+               return -EPROTO;
        put_bcc_le(byte_count, pTargetSMB);
 
        byte_count = pTargetSMB->smb_buf_length;
        byte_count += total_in_buf2;
-
-       /* BB also add check that we are not beyond maximum buffer size */
-
+       /* don't allow buffer to overflow */
+       if (byte_count > CIFSMaxBufSize)
+               return -ENOBUFS;
        pTargetSMB->smb_buf_length = byte_count;
 
+       memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
+
        if (remaining == total_in_buf2) {
                cFYI(1, "found the last secondary response");
                return 0; /* we are done */