===================================================================
@@ -3667,16 +3667,12 @@ CIFSTCon(unsigned int xid, struct cifsSe
BCC(smb_buffer_response)) {
kfree(tcon->nativeFileSystem);
tcon->nativeFileSystem =
- kzalloc(2*(length + 1), GFP_KERNEL);
+ kzalloc((4 * length) + 2, GFP_KERNEL);
if (tcon->nativeFileSystem)
cifs_strfromUCS_le(
tcon->nativeFileSystem,
(__le16 *) bcc_ptr,
length, nls_codepage);
- bcc_ptr += 2 * length;
- bcc_ptr[0] = 0; /* null terminate the string */
- bcc_ptr[1] = 0;
- bcc_ptr += 2;
}
/* else do not bother copying these information fields*/
} else {
Author: Jeff Layton <jlayton@redhat.com> Date: Thu Apr 16 11:21:52 2009 -0400 cifs: fix buffer size for tcon->nativeFileSystem field The buffer for this was resized recently to fix a bug. It's still possible however that a malicious server could overflow this field by sending characters in it that are >2 bytes in the local charset. Double the size of the buffer to account for this possibility. Also get rid of some really strange and seemingly pointless NULL termination. It's NULL terminating the string in the source buffer, but by the time that happens, we've already copied the string. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com> --- fs/cifs/connect.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)