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| author | Arjun Sreedharan <arjun024@gmail.com> | 2015-03-16 18:37:47 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-03-23 12:24:12 +0300 |
| commit | 1c1d046be692493d00a4831d4fbc266745008e09 (patch) | |
| tree | 30639ed59ad0cf6fab826f88c9dda96fc31e9b66 | |
| parent | 91d8f0416f3989e248d3a3d3efb821eda10a85d2 (diff) | |
| download | linux-1c1d046be692493d00a4831d4fbc266745008e09.tar.xz | |
x86/boot: Standardize strcmp()
strcmp() is always expected to return 0 when arguments are equal,
negative when its first argument @str1 is less than its second argument
@str2 and a positive value otherwise. Previously strcmp("a", "b")
returned 1. Now it gives -1, as it is supposed to.
Until now this bug never triggered, because all uses for strcmp() in the
boot code tested for nonzero:
triton:~/tip> git grep strcmp arch/x86/boot/
arch/x86/boot/boot.h:int strcmp(const char *str1, const char *str2);
arch/x86/boot/edd.c: if (!strcmp(eddarg, "skipmbr") || !strcmp(eddarg, "skip")) {
arch/x86/boot/edd.c: else if (!strcmp(eddarg, "off"))
arch/x86/boot/edd.c: else if (!strcmp(eddarg, "on"))
should in the future strcmp() be used in a comparative way in the boot
code, it might have led to (not so subtle) bugs.
Signed-off-by: Arjun Sreedharan <arjun024@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1426520267-1803-1-git-send-email-arjun024@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | arch/x86/boot/string.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/boot/string.c b/arch/x86/boot/string.c index 493f3fd9f139..318b8465d302 100644 --- a/arch/x86/boot/string.c +++ b/arch/x86/boot/string.c @@ -30,7 +30,7 @@ int strcmp(const char *str1, const char *str2) int delta = 0; while (*s1 || *s2) { - delta = *s2 - *s1; + delta = *s1 - *s2; if (delta) return delta; s1++; |