linux-kernel - [PATCH 4.18 008/168] scsi: csiostor: add a check for NULL pointer after kmalloc()

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Message-Id: <20181008175620.355042947@linuxfoundation.org>
Date:   Mon,  8 Oct 2018 20:29:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Colin Ian King <colin.king@...onical.com>,
        Varun Prakash <varun@...lsio.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 008/168] scsi: csiostor: add a check for NULL pointer after kmalloc()

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Varun Prakash <varun@...lsio.com>

[ Upstream commit 89809b028b6f54187b7d81a0c69b35d394c52e62 ]

Reported-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Varun Prakash <varun@...lsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/csiostor/csio_hw.c |   16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

--- a/drivers/scsi/csiostor/csio_hw.c
+++ b/drivers/scsi/csiostor/csio_hw.c
@@ -2275,8 +2275,8 @@ bye:
 }
 
 /*
- * Returns -EINVAL if attempts to flash the firmware failed
- * else returns 0,
+ * Returns -EINVAL if attempts to flash the firmware failed,
+ * -ENOMEM if memory allocation failed else returns 0,
  * if flashing was not attempted because the card had the
  * latest firmware ECANCELED is returned
  */
@@ -2304,6 +2304,13 @@ csio_hw_flash_fw(struct csio_hw *hw, int
 		return -EINVAL;
 	}
 
+	/* allocate memory to read the header of the firmware on the
+	 * card
+	 */
+	card_fw = kmalloc(sizeof(*card_fw), GFP_KERNEL);
+	if (!card_fw)
+		return -ENOMEM;
+
 	if (csio_is_t5(pci_dev->device & CSIO_HW_CHIP_MASK))
 		fw_bin_file = FW_FNAME_T5;
 	else
@@ -2317,11 +2324,6 @@ csio_hw_flash_fw(struct csio_hw *hw, int
 		fw_size = fw->size;
 	}
 
-	/* allocate memory to read the header of the firmware on the
-	 * card
-	 */
-	card_fw = kmalloc(sizeof(*card_fw), GFP_KERNEL);
-
 	/* upgrade FW logic */
 	ret = csio_hw_prep_fw(hw, fw_info, fw_data, fw_size, card_fw,
 			 hw->fw_state, reset);