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fix misaligned read on early string termination in strchr

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this could actually cause rare crashes in the case where a short
string is located at the end of a page and the following page is not
readable, and in fact this was seen in gcc compiling certain files.
This commit is contained in:
Rich Felker
2011-04-05 09:27:41 -04:00
parent 2f3d02cd83
commit 16675df793
1 changed files with 2 additions and 1 deletions
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3
src/string/strchr.c
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@ -15,8 +15,9 @@ char *strchr(const char *s, int c)
c = (unsigned char)c; c = (unsigned char)c;
if (!c) return (char *)s + strlen(s); if (!c) return (char *)s + strlen(s);
for (; ((uintptr_t)s & ALIGN) && *s; s++) for (; ((uintptr_t)s & ALIGN); s++)
if (*(unsigned char *)s == c) return (char *)s; if (*(unsigned char *)s == c) return (char *)s;
else if (!*s) return 0;
k = ONES * c; k = ONES * c;
for (w = (void *)s; !HASZERO(*w) && !HASZERO(*w^k); w++); for (w = (void *)s; !HASZERO(*w) && !HASZERO(*w^k); w++);
for (s = (void *)w; *s; s++) for (s = (void *)w; *s; s++)