x86/platform/intel-mid: Fix a format string overflow warning
authorArnd Bergmann <arnd@arndb.de>
Wed, 19 Jul 2017 12:53:06 +0000 (14:53 +0200)
committerIngo Molnar <mingo@kernel.org>
Thu, 20 Jul 2017 08:46:25 +0000 (10:46 +0200)
commit0bc73048d7baecf94117d1a948853a627e6ba5c8
tree46334baff87ef0893cf22aa857ee2e094c802640
parentd689c64d189e43d782fec5649fb0afe303c5b3f9
x86/platform/intel-mid: Fix a format string overflow warning

We have space for exactly three characters 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 [-21474836472147483647]
  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. In practice, this is safe, because
there won't be a large number of max7315 devices in the systems, and
both the format and the length are defined by the firmware interface.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170719125310.2487451-9-arnd@arndb.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/platform/intel-mid/device_libs/platform_max7315.c