From: Takashi Iwai <tiwai@suse.de>
Date: Thu, 19 Mar 2020 16:46:41 +0100
Subject: IB/hfi1: Use scnprintf() for avoiding potential buffer overflow
Patch-mainline: v5.7-rc1
Git-commit: 23ab5261e29b6b95803ee8dc919ae76e260b358d
References: jsc#SLE-13208

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/20200319154641.23711-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/hw/hfi1/fault.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/infiniband/hw/hfi1/fault.c
+++ b/drivers/infiniband/hw/hfi1/fault.c
@@ -222,11 +222,11 @@ static ssize_t fault_opcodes_read(struct
 	while (bit < bitsize) {
 		zero = find_next_zero_bit(fault->opcodes, bitsize, bit);
 		if (zero - 1 != bit)
-			size += snprintf(data + size,
+			size += scnprintf(data + size,
 					 datalen - size - 1,
 					 "0x%lx-0x%lx,", bit, zero - 1);
 		else
-			size += snprintf(data + size,
+			size += scnprintf(data + size,
 					 datalen - size - 1, "0x%lx,",
 					 bit);
 		bit = find_next_bit(fault->opcodes, bitsize, zero);