Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754256AbdFSSjo (ORCPT + 2 others); Mon, 19 Jun 2017 14:39:44 -0400 Received: from wtarreau.pck.nerim.net ([62.212.114.60]:52747 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754226AbdFSSjj (ORCPT ); Mon, 19 Jun 2017 14:39:39 -0400 From: Willy Tarreau To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, linux@roeck-us.net Cc: Quinn Tran , Himanshu Madhani , Bart Van Assche , Willy Tarreau Subject: [PATCH 3.10 103/268] qla2xxx: Fix crash due to null pointer access Date: Mon, 19 Jun 2017 20:30:02 +0200 Message-Id: <1497897167-14556-104-git-send-email-w@1wt.eu> X-Mailer: git-send-email 2.8.0.rc2.1.gbe9624a In-Reply-To: <1497897167-14556-1-git-send-email-w@1wt.eu> References: <1497897167-14556-1-git-send-email-w@1wt.eu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: From: Quinn Tran commit fc1ffd6cb38a1c1af625b9833c41928039e733f5 upstream. During code inspection, while investigating following stack trace seen on one of the test setup, we found out there was possibility of memory leak becuase driver was not unwinding the stack properly. This issue has not been reproduced in a test environment or on a customer setup. Here's stack trace that was seen. [1469877.797315] Call Trace: [1469877.799940] [] qla2x00_mem_alloc+0xb09/0x10c0 [qla2xxx] [1469877.806980] [] qla2x00_probe_one+0x86a/0x1b50 [qla2xxx] [1469877.814013] [] ? __pm_runtime_resume+0x51/0xa0 [1469877.820265] [] ? _raw_spin_lock_irqsave+0x25/0x90 [1469877.826776] [] ? _raw_spin_unlock_irqrestore+0x6d/0x80 [1469877.833720] [] ? preempt_count_sub+0xb1/0x100 [1469877.839885] [] ? _raw_spin_unlock_irqrestore+0x4c/0x80 [1469877.846830] [] local_pci_probe+0x4c/0xb0 [1469877.852562] [] ? preempt_count_sub+0xb1/0x100 [1469877.858727] [] pci_call_probe+0x89/0xb0 Signed-off-by: Quinn Tran Signed-off-by: Himanshu Madhani Reviewed-by: Christoph Hellwig [ bvanassche: Fixed spelling in patch description ] Signed-off-by: Bart Van Assche Signed-off-by: Willy Tarreau --- drivers/scsi/qla2xxx/qla_os.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c index 66c495d..40fe8a7 100644 --- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -3301,7 +3301,7 @@ qla2x00_mem_alloc(struct qla_hw_data *ha, uint16_t req_len, uint16_t rsp_len, sizeof(struct ct6_dsd), 0, SLAB_HWCACHE_ALIGN, NULL); if (!ctx_cachep) - goto fail_free_gid_list; + goto fail_free_srb_mempool; } ha->ctx_mempool = mempool_create_slab_pool(SRB_MIN_REQ, ctx_cachep); @@ -3454,7 +3454,7 @@ qla2x00_mem_alloc(struct qla_hw_data *ha, uint16_t req_len, uint16_t rsp_len, ha->loop_id_map = kzalloc(BITS_TO_LONGS(LOOPID_MAP_SIZE) * sizeof(long), GFP_KERNEL); if (!ha->loop_id_map) - goto fail_async_pd; + goto fail_loop_id_map; else { qla2x00_set_reserved_loop_ids(ha); ql_dbg_pci(ql_dbg_init, ha->pdev, 0x0123, @@ -3463,6 +3463,8 @@ qla2x00_mem_alloc(struct qla_hw_data *ha, uint16_t req_len, uint16_t rsp_len, return 0; +fail_loop_id_map: + dma_pool_free(ha->s_dma_pool, ha->async_pd, ha->async_pd_dma); fail_async_pd: dma_pool_free(ha->s_dma_pool, ha->ex_init_cb, ha->ex_init_cb_dma); fail_ex_init_cb: @@ -3490,6 +3492,10 @@ fail_free_ms_iocb: dma_pool_free(ha->s_dma_pool, ha->ms_iocb, ha->ms_iocb_dma); ha->ms_iocb = NULL; ha->ms_iocb_dma = 0; + + if (ha->sns_cmd) + dma_free_coherent(&ha->pdev->dev, sizeof(struct sns_cmd_pkt), + ha->sns_cmd, ha->sns_cmd_dma); fail_dma_pool: if (IS_QLA82XX(ha) || ql2xenabledif) { dma_pool_destroy(ha->fcp_cmnd_dma_pool); @@ -3507,10 +3513,12 @@ fail_free_nvram: kfree(ha->nvram); ha->nvram = NULL; fail_free_ctx_mempool: - mempool_destroy(ha->ctx_mempool); + if (ha->ctx_mempool) + mempool_destroy(ha->ctx_mempool); ha->ctx_mempool = NULL; fail_free_srb_mempool: - mempool_destroy(ha->srb_mempool); + if (ha->srb_mempool) + mempool_destroy(ha->srb_mempool); ha->srb_mempool = NULL; fail_free_gid_list: dma_free_coherent(&ha->pdev->dev, qla2x00_gid_list_size(ha), -- 2.8.0.rc2.1.gbe9624a