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bpo-41524: fix pointer bug in PyOS_mystr{n}icmp (GH-21845)
* bpo-41524: fix pointer bug in PyOS_mystr{n}icmp The existing implementations of PyOS_mystrnicmp and PyOS_mystricmp can increment pointers beyond the end of a string. This commit fixes those cases by moving the mutation out of the condition. * 📜🤖 Added by blurb_it. * Address comments Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
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@ -0,0 +1,2 @@
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Fix bug in PyOS_mystrnicmp and PyOS_mystricmp that incremented
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pointers beyond the end of a string.
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@ -6,21 +6,25 @@
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int
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PyOS_mystrnicmp(const char *s1, const char *s2, Py_ssize_t size)
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{
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const unsigned char *p1, *p2;
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if (size == 0)
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return 0;
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while ((--size > 0) &&
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(tolower((unsigned)*s1) == tolower((unsigned)*s2))) {
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if (!*s1++ || !*s2++)
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break;
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p1 = (const unsigned char *)s1;
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p2 = (const unsigned char *)s2;
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for (; (--size > 0) && *p1 && *p2 && (tolower(*p1) == tolower(*p2));
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p1++, p2++) {
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;
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}
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return tolower((unsigned)*s1) - tolower((unsigned)*s2);
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return tolower(*p1) - tolower(*p2);
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}
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int
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PyOS_mystricmp(const char *s1, const char *s2)
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{
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while (*s1 && (tolower((unsigned)*s1++) == tolower((unsigned)*s2++))) {
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const unsigned char *p1 = (const unsigned char *)s1;
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const unsigned char *p2 = (const unsigned char *)s2;
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for (; *p1 && *p2 && (tolower(*p1) == tolower(*p2)); p1++, p2++) {
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;
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}
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return (tolower((unsigned)*s1) - tolower((unsigned)*s2));
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return (tolower(*p1) - tolower(*p2));
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}
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