From e7701557bfdd81ff44cab13a80439319a735d8e2 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Wed, 2 Aug 2017 13:31:58 -0700 Subject: [PATCH] kasan: avoid -Wmaybe-uninitialized warning gcc-7 produces this warning: mm/kasan/report.c: In function 'kasan_report': mm/kasan/report.c:351:3: error: 'info.first_bad_addr' may be used uninitialized in this function [-Werror=maybe-uninitialized] print_shadow_for_address(info->first_bad_addr); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ mm/kasan/report.c:360:27: note: 'info.first_bad_addr' was declared here The code seems fine as we only print info.first_bad_addr when there is a shadow, and we always initialize it in that case, but this is relatively hard for gcc to figure out after the latest rework. Adding an intialization to the most likely value together with the other struct members shuts up that warning. Fixes: b235b9808664 ("kasan: unify report headers") Link: https://patchwork.kernel.org/patch/9641417/ Link: http://lkml.kernel.org/r/20170725152739.4176967-1-arnd@arndb.de Signed-off-by: Arnd Bergmann Suggested-by: Alexander Potapenko Suggested-by: Andrey Ryabinin Acked-by: Andrey Ryabinin Cc: Dmitry Vyukov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/kasan/report.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/kasan/report.c b/mm/kasan/report.c index 04bb1d3eb9ec..6bcfb01ba038 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -401,6 +401,7 @@ void kasan_report(unsigned long addr, size_t size, disable_trace_on_warning(); info.access_addr = (void *)addr; + info.first_bad_addr = (void *)addr; info.access_size = size; info.is_write = is_write; info.ip = ip;