cifs: check kmalloc before use

commit 126c97f4d0d1b5b956e8b0740c81a2b2a2ae548c upstream.

The kmalloc was not being checked - if it fails issue a warning
and return -ENOMEM to the caller.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Fixes: b8da344b74c8 ("cifs: dynamic allocation of ntlmssp blob")
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
cc: Stable <stable@vger.kernel.org>`
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index a035d1a..9bc7a29 100644 (file)
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -398,6 +398,12 @@ int build_ntlmssp_auth_blob(unsigned char **pbuffer,
                goto setup_ntlmv2_ret;
        }
        *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
+       if (!*pbuffer) {
+               rc = -ENOMEM;
+               cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
+               *buflen = 0;
+               goto setup_ntlmv2_ret;
+       }
        sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
 
        memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);