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 C05D18F74 for ; Sun, 16 Jul 2023 20:01:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 46366C433C7; Sun, 16 Jul 2023 20:01:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1689537711; bh=uIBpqFhJ9A0sGHFzkKHP0AqumEdBc5S5Cf1Oi1UM37Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AIsVXcf6Ipu7Y2cpuMuPJi+CEJRHyZZdzdxvot9rxIT5Hf+uhbjkEuO1XOKGKVZqk EsTKGdOjmgcYQPzGpsMBrysnKd8NC5km6L5sIi/5mdyNnurskVxFSaB150cTuEcByC ZgMLa+K+7KST2SuaT0RMr/xtDnOIZjk+HSLBiUQY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Anjaneyulu , Gregory Greenman , Johannes Berg , Sasha Levin Subject: [PATCH 6.4 176/800] wifi: iwlwifi: pcie: fix NULL pointer dereference in iwl_pcie_irq_rx_msix_handler() Date: Sun, 16 Jul 2023 21:40:29 +0200 Message-ID: <20230716194953.194200824@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230716194949.099592437@linuxfoundation.org> References: <20230716194949.099592437@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: Anjaneyulu [ Upstream commit 1902f1953b8ba100ee8705cb8a6f1a9795550eca ] rxq can be NULL only when trans_pcie->rxq is NULL and entry->entry is zero. For the case when entry->entry is not equal to 0, rxq won't be NULL even if trans_pcie->rxq is NULL. Modify checker to check for trans_pcie->rxq. Fixes: abc599efa67b ("iwlwifi: pcie: don't crash when rx queues aren't allocated in interrupt") Signed-off-by: Anjaneyulu Signed-off-by: Gregory Greenman Link: https://lore.kernel.org/r/20230614123446.5a5eb3889a4a.I375a1d58f16b48cd2044e7b7caddae512d7c86fd@changeid Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- drivers/net/wireless/intel/iwlwifi/pcie/rx.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c index 0d7890f99a5fb..90a46faaaffdf 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c @@ -1636,14 +1636,14 @@ irqreturn_t iwl_pcie_irq_rx_msix_handler(int irq, void *dev_id) struct msix_entry *entry = dev_id; struct iwl_trans_pcie *trans_pcie = iwl_pcie_get_trans_pcie(entry); struct iwl_trans *trans = trans_pcie->trans; - struct iwl_rxq *rxq = &trans_pcie->rxq[entry->entry]; + struct iwl_rxq *rxq; trace_iwlwifi_dev_irq_msix(trans->dev, entry, false, 0, 0); if (WARN_ON(entry->entry >= trans->num_rx_queues)) return IRQ_NONE; - if (!rxq) { + if (!trans_pcie->rxq) { if (net_ratelimit()) IWL_ERR(trans, "[%d] Got MSI-X interrupt before we have Rx queues\n", @@ -1651,6 +1651,7 @@ irqreturn_t iwl_pcie_irq_rx_msix_handler(int irq, void *dev_id) return IRQ_NONE; } + rxq = &trans_pcie->rxq[entry->entry]; lock_map_acquire(&trans->sync_cmd_lockdep_map); IWL_DEBUG_ISR(trans, "[%d] Got interrupt\n", entry->entry); -- 2.39.2