[PATCH 16/22] x86: intel-mid: fix a format string overflow warning

[Arnd Bergmann]

We have space for exactly one character for the index in "max7315_%d_base",
but as gcc points out having more would cause an string overflow:

arch/x86/platform/intel-mid/device_libs/platform_max7315.c: In function 
'max7315_platform_data':
arch/x86/platform/intel-mid/device_libs/platform_max7315.c:41:26: error: '%d' 
directive writing between 1 and 11 bytes into a region of size 9 
[-Werror=format-overflow=]
   sprintf(base_pin_name, "max7315_%d_base", nr);
                          ^~~~~~~~~~~~~~~~~
arch/x86/platform/intel-mid/device_libs/platform_max7315.c:41:26: note: 
directive argument in the range [-2147483647, 2147483647]
arm-soc/arch/x86/platform/intel-mid/device_libs/platform_max7315.c:41:3: note: 
'sprintf' output between 15 and 25 bytes into a destination of size 17
   sprintf(base_pin_name, "max7315_%d_base", nr);

This makes it use an snprintf() to truncate the string if that happened
rather than overflowing the stack.

Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 arch/x86/platform/intel-mid/device_libs/platform_max7315.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/platform/intel-mid/device_libs/platform_max7315.c 
b/arch/x86/platform/intel-mid/device_libs/platform_max7315.c
index 6e075afa7877..58337b2bc682 100644
--- a/arch/x86/platform/intel-mid/device_libs/platform_max7315.c
+++ b/arch/x86/platform/intel-mid/device_libs/platform_max7315.c
@@ -38,8 +38,10 @@ static void __init *max7315_platform_data(void *info)
         */
        strcpy(i2c_info->type, "max7315");
        if (nr++) {
-               sprintf(base_pin_name, "max7315_%d_base", nr);
-               sprintf(intr_pin_name, "max7315_%d_int", nr);
+               snprintf(base_pin_name, sizeof(base_pin_name),
+                        "max7315_%d_base", nr);
+               snprintf(intr_pin_name, sizeof(intr_pin_name),
+                        "max7315_%d_int", nr);
        } else {
                strcpy(base_pin_name, "max7315_base");
                strcpy(intr_pin_name, "max7315_int");
-- 
2.9.0