From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 66F3E1F95A for ; Tue, 1 Aug 2023 09:43:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DBDFDC433C7; Tue, 1 Aug 2023 09:43:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1690883038; bh=ayWGq/45E8IlQD7a+uCQlhVOhAK3GKm4ap5vuUBnl1s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OoDq1VXwc09Sz/5cdLw1YM7BQy5RmLayYvdkV/rIGvhcGdu7dlzhmey3xhfK8+dnh qxlyUYZTYsmBaqK0ht7VEDYvEKI0B1LYcJwpjEaB9oNtYGxJMRI0EqihZBM9E72+5+ Kk0Ls7EznjRNiPE7+yo+y3PNYYubgQUS0TvWBucc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jacob Keller , Rafal Romanowski , Tony Nguyen , Sasha Levin Subject: [PATCH 6.4 064/239] iavf: fix potential deadlock on allocation failure Date: Tue, 1 Aug 2023 11:18:48 +0200 Message-ID: <20230801091927.975379940@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230801091925.659598007@linuxfoundation.org> References: <20230801091925.659598007@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Jacob Keller [ Upstream commit a2f054c10bef0b54600ec9cb776508443e941343 ] In iavf_adminq_task(), if kzalloc() fails to allocate the event.msg_buf, the function will exit without releasing the adapter->crit_lock. This is unlikely, but if it happens, the next access to that mutex will deadlock. Fix this by moving the unlock to the end of the function, and adding a new label to allow jumping to the unlock portion of the function exit flow. Fixes: fc2e6b3b132a ("iavf: Rework mutexes for better synchronisation") Signed-off-by: Jacob Keller Tested-by: Rafal Romanowski Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/iavf/iavf_main.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c index ba96312feb505..6c25d240e70bc 100644 --- a/drivers/net/ethernet/intel/iavf/iavf_main.c +++ b/drivers/net/ethernet/intel/iavf/iavf_main.c @@ -3300,7 +3300,7 @@ static void iavf_adminq_task(struct work_struct *work) event.buf_len = IAVF_MAX_AQ_BUF_SIZE; event.msg_buf = kzalloc(event.buf_len, GFP_KERNEL); if (!event.msg_buf) - goto out; + goto unlock; do { ret = iavf_clean_arq_element(hw, &event, &pending); @@ -3315,7 +3315,6 @@ static void iavf_adminq_task(struct work_struct *work) if (pending != 0) memset(event.msg_buf, 0, IAVF_MAX_AQ_BUF_SIZE); } while (pending); - mutex_unlock(&adapter->crit_lock); if (iavf_is_reset_in_progress(adapter)) goto freedom; @@ -3359,6 +3358,8 @@ static void iavf_adminq_task(struct work_struct *work) freedom: kfree(event.msg_buf); +unlock: + mutex_unlock(&adapter->crit_lock); out: /* re-enable Admin queue interrupt cause */ iavf_misc_irq_enable(adapter); -- 2.39.2