From: Takashi Iwai <tiwai@suse.de>
Date: Sun, 15 Mar 2020 10:42:34 +0100
Subject: scsi: aacraid: Use scnprintf() for avoiding potential buffer overflow
Git-commit: 82893ced87414f255977a9132db8f667ee01882b
Patch-mainline: v5.7-rc1
References: jsc#SLE-15152
Since snprintf() returns the would-be-output size instead of the actual
output size, the succeeding calls may go beyond the given buffer limit.
Fix it by replacing with scnprintf().
Link: https://lore.kernel.org/r/20200315094241.9086-2-tiwai@suse.de
Cc: "James E . J . Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K . Petersen" <martin.petersen@oracle.com>
Cc: Adaptec OEM Raid Solutions <aacraid@microsemi.com>
Cc: linux-scsi@vger.kernel.org
Acked-by: Balsundar P <Balsundar.P@microchip.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Lee Duncan <lduncan@suse.com>
---
drivers/scsi/aacraid/linit.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index b1d133de29ab..8b583eec25b5 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -1287,20 +1287,21 @@ static ssize_t aac_show_flags(struct device *cdev,
if (nblank(dprintk(x)))
len = snprintf(buf, PAGE_SIZE, "dprintk\n");
#ifdef AAC_DETAILED_STATUS_INFO
- len += snprintf(buf + len, PAGE_SIZE - len,
- "AAC_DETAILED_STATUS_INFO\n");
+ len += scnprintf(buf + len, PAGE_SIZE - len,
+ "AAC_DETAILED_STATUS_INFO\n");
#endif
if (dev->raw_io_interface && dev->raw_io_64)
- len += snprintf(buf + len, PAGE_SIZE - len,
- "SAI_READ_CAPACITY_16\n");
+ len += scnprintf(buf + len, PAGE_SIZE - len,
+ "SAI_READ_CAPACITY_16\n");
if (dev->jbod)
- len += snprintf(buf + len, PAGE_SIZE - len, "SUPPORTED_JBOD\n");
+ len += scnprintf(buf + len, PAGE_SIZE - len,
+ "SUPPORTED_JBOD\n");
if (dev->supplement_adapter_info.supported_options2 &
AAC_OPTION_POWER_MANAGEMENT)
- len += snprintf(buf + len, PAGE_SIZE - len,
- "SUPPORTED_POWER_MANAGEMENT\n");
+ len += scnprintf(buf + len, PAGE_SIZE - len,
+ "SUPPORTED_POWER_MANAGEMENT\n");
if (dev->msi)
- len += snprintf(buf + len, PAGE_SIZE - len, "PCI_HAS_MSI\n");
+ len += scnprintf(buf + len, PAGE_SIZE - len, "PCI_HAS_MSI\n");
return len;
}