netdev - Re: sctp use-uninitialized warning in net-2.6.25

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Date:	Fri, 18 Jan 2008 20:37:23 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	vladislav.yasevich@...com
Cc:	akpm@...ux-foundation.org, netdev@...r.kernel.org
Subject: Re: sctp use-uninitialized warning in net-2.6.25

From: Vlad Yasevich <vladislav.yasevich@...com>
Date: Fri, 18 Jan 2008 21:17:56 -0500

> Hmm... in the code I am looking at, it's set in both zero and
> non-zero cases so it does solve the issue.
> 
> So does initializing it to NO_ERROR like you did.

Here is the code block in question in net-2.6.25:

	/* Verify the INIT chunk before processing it. */
	err_chunk = NULL;
	if (!sctp_verify_init(asoc, chunk->chunk_hdr->type,
			      (sctp_init_chunk_t *)chunk->chunk_hdr, chunk,
			      &err_chunk)) {
 ...
		if (err_chunk) {
 ...
			if (packet) {
				sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT,
						SCTP_PACKET(packet));
				SCTP_INC_STATS(SCTP_MIB_OUTCTRLCHUNKS);
				error = SCTP_ERROR_INV_PARAM;
			} else {
				error = SCTP_ERROR_NO_RESOURCE;
			}
		}
 ...
		return sctp_stop_t1_and_abort(commands, error, ECONNREFUSED,
						asoc, chunk->transport);

If err_chunk == NULL at the "if (err_chunk)" test, error
will be left uninitialized, even after being moved as you
have suggested (right after the sctp_verify_init() call).

Thanks.
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