50 lines
2.0 KiB
Diff
50 lines
2.0 KiB
Diff
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From 016c8ffcc6c9d41d145035ef5df607568880e3b3 Mon Sep 17 00:00:00 2001
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From: Karl Williamson <khw@cpan.org>
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Date: Tue, 24 Jul 2018 17:20:08 -0600
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Subject: [PATCH] utf8.c: Make safer a deprecated function
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This function is only called from deprecated functions, but they may be
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moved to ppport.h. It is lacking a length parameter, so malformed UTF-8
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may cause it to read beyond the buffer. This commit causes it to not
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read beyond a NUL character, which makes it safe for the common case
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that the input is a C string.
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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utf8.c | 9 +++++----
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1 file changed, 5 insertions(+), 4 deletions(-)
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diff --git a/utf8.c b/utf8.c
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index 8471fb8093..3062f58338 100644
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--- a/utf8.c
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+++ b/utf8.c
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@@ -3100,7 +3100,9 @@ S_is_utf8_common(pTHX_ const U8 *const p, SV **swash,
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* Note that it is assumed that the buffer length of <p> is enough to
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* contain all the bytes that comprise the character. Thus, <*p> should
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* have been checked before this call for mal-formedness enough to assure
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- * that. */
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+ * that. This function, does make sure to not look past any NUL, so it is
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+ * safe to use on C, NUL-terminated, strings */
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+ STRLEN len = my_strnlen((char *) p, UTF8SKIP(p));
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PERL_ARGS_ASSERT_IS_UTF8_COMMON;
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@@ -3109,9 +3111,8 @@ S_is_utf8_common(pTHX_ const U8 *const p, SV **swash,
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* as far as there being enough bytes available in it to accommodate the
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* character without reading beyond the end, and pass that number on to the
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* validating routine */
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- if (! isUTF8_CHAR(p, p + UTF8SKIP(p))) {
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- _force_out_malformed_utf8_message(p, p + UTF8SKIP(p),
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- _UTF8_NO_CONFIDENCE_IN_CURLEN,
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+ if (! isUTF8_CHAR(p, p + len)) {
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+ _force_out_malformed_utf8_message(p, p + len, _UTF8_NO_CONFIDENCE_IN_CURLEN,
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1 /* Die */ );
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NOT_REACHED; /* NOTREACHED */
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}
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--
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2.14.4
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