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scsi: be2iscsi: Use scnprintf() for avoiding potential buffer overflow

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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/20200315094241.9086-3-tiwai@suse.de
Cc: "James E . J . Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K . Petersen" <martin.petersen@oracle.com>
Cc: Subbu Seetharaman <subbu.seetharaman@broadcom.com>
Cc: Ketan Mukadam <ketan.mukadam@broadcom.com>
Cc: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Takashi Iwai 2020-03-15 10:42:35 +01:00 committed by Martin K. Petersen
parent 82893ced87
commit 7cd1615e32
1 changed files with 10 additions and 10 deletions
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20
drivers/scsi/be2iscsi/be_mgmt.c
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@ -1178,12 +1178,12 @@ beiscsi_active_session_disp(struct device *dev, struct device_attribute *attr,
if (test_bit(ulp_num, (void *)&phba->fw_config.ulp_supported)) {
avlbl_cids = BEISCSI_ULP_AVLBL_CID(phba, ulp_num);
total_cids = BEISCSI_GET_CID_COUNT(phba, ulp_num);
len += snprintf(buf+len, PAGE_SIZE - len,
"ULP%d : %d\n", ulp_num,
(total_cids - avlbl_cids));
len += scnprintf(buf+len, PAGE_SIZE - len,
"ULP%d : %d\n", ulp_num,
(total_cids - avlbl_cids));
} else
len += snprintf(buf+len, PAGE_SIZE - len,
"ULP%d : %d\n", ulp_num, 0);
len += scnprintf(buf+len, PAGE_SIZE - len,
"ULP%d : %d\n", ulp_num, 0);
}
return len;
@ -1208,12 +1208,12 @@ beiscsi_free_session_disp(struct device *dev, struct device_attribute *attr,
for (ulp_num = 0; ulp_num < BEISCSI_ULP_COUNT; ulp_num++) {
if (test_bit(ulp_num, (void *)&phba->fw_config.ulp_supported))
len += snprintf(buf+len, PAGE_SIZE - len,
"ULP%d : %d\n", ulp_num,
BEISCSI_ULP_AVLBL_CID(phba, ulp_num));
len += scnprintf(buf+len, PAGE_SIZE - len,
"ULP%d : %d\n", ulp_num,
BEISCSI_ULP_AVLBL_CID(phba, ulp_num));
else
len += snprintf(buf+len, PAGE_SIZE - len,
"ULP%d : %d\n", ulp_num, 0);
len += scnprintf(buf+len, PAGE_SIZE - len,
"ULP%d : %d\n", ulp_num, 0);
}
return len;