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([2402:f000:4:1006:809:ffff:fffe:18ea]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7f4bf7be436sm12036058b3a.0.2025.12.15.01.25.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Dec 2025 01:25:22 -0800 (PST) From: Tuo Li To: ketan.mukadam@broadcom.com, James.Bottomley@HansenPartnership.com, martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Tuo Li Subject: [PATCH] scsi: be2iscsi: Fix a possible null-pointer dereference in beiscsi_alloc_mem() Date: Mon, 15 Dec 2025 17:25:09 +0800 Message-ID: <20251215092509.4035061-1-islituo@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" There appears to be a potential null-pointer dereference in the error-handling path. Consider the following scenario: 1. One or more mem_descr->mem_array objects have been allocated successfully, so i is non-zero. 2. In the i-th iteration, DMA memory allocation succeeds, resulting in a non-zero j. 3. A subsequent kmalloc_array() call fails, leaving mem_descr->mem_array as NULL and transferring control to the free_mem label. Under these conditions, the cleanup code may dereference mem_descr->mem_array while freeing DMA memory, as shown below: dma_free_coherent(&phba->pcidev->dev, mem_descr->mem_array[j - 1].size, mem_descr->mem_array[j - 1]. virtual_address, (unsigned long)mem_descr-> mem_array[j - 1]. bus_address.u.a64.address); To reduce the risk of such a null-pointer dereference, it may be preferable to separate the cleanup of resources associated with a failed mem_descr->mem_array allocation from the cleanup of previously initialized descriptors. Likewise, DMA memory allocated prior to a failed mem_arr->virtual_address allocation could be released independently, rather than being handled by the shared while loop under the free_mem label. Signed-off-by: Tuo Li --- drivers/scsi/be2iscsi/be_main.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_mai= n.c index a0e794ffc980..1a22871843a0 100644 --- a/drivers/scsi/be2iscsi/be_main.c +++ b/drivers/scsi/be2iscsi/be_main.c @@ -2554,8 +2554,18 @@ static int beiscsi_alloc_mem(struct beiscsi_hba *phb= a) kfree(mem_arr_orig); return 0; free_mem: - mem_descr->num_elements =3D j; - while ((i) || (j)) { + while (j) { + j--; + mem_arr--; + dma_free_coherent(&phba->pcidev->dev, + mem_arr->size, + mem_arr->virtual_address, + (unsigned long)mem_arr-> + bus_address.u.a64.address); + } + while (i) { + i--; + mem_descr--; for (j =3D mem_descr->num_elements; j > 0; j--) { dma_free_coherent(&phba->pcidev->dev, mem_descr->mem_array[j - 1].size, @@ -2565,11 +2575,7 @@ static int beiscsi_alloc_mem(struct beiscsi_hba *phb= a) mem_array[j - 1]. bus_address.u.a64.address); } - if (i) { - i--; - kfree(mem_descr->mem_array); - mem_descr--; - } + kfree(mem_descr->mem_array); } kfree(mem_arr_orig); kfree(phba->init_mem); --=20 2.43.0