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[CIFS] Possible null ptr deref in SMB2_tcon 

As Raphael Geissert pointed out, tcon_error_exit can dereference tcon
and there is one path in which tcon can be null.

Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org> # v3.7+
Reported-by: Raphael Geissert <geissert@debian.org>
This commit is contained in:
Steve French 2014-08-17 00:22:24 -05:00
parent 754789a1c0
commit 18f39e7be0
1 changed files with 2 additions and 1 deletions
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3
fs/cifs/smb2pdu.c
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@ -907,7 +907,8 @@ SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
tcon_error_exit: tcon_error_exit:
if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) { if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree); cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
tcon->bad_network_name = true; if (tcon)
tcon->bad_network_name = true;
} }
goto tcon_exit; goto tcon_exit;
} }