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From cfb736762c1becf344ce6beaa701ff2e1abd5f9c Mon Sep 17 00:00:00 2001
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From: Yves Orton <demerphq@gmail.com>
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Date: Tue, 13 Sep 2016 23:14:49 +0200
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Subject: [PATCH 4/5] fix #129267: rework gv_fetchmethod_pvn_flags separator
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parsing
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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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With previous code we could overrun the end of the name when
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the last char in the string was a colon. This reworks the code
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so it is more clear what is going on, and so it more similar
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to other code that also parses out package separaters in gv.c.
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This is a rework of the reverted patches:
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243ca72 rename "nend" name_cursor in Perl_gv_fetchmethod_pvn_flags
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b053c93 fix: [perl #129267] Possible string overrun with invalid len in gv.c
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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gv.c | 36 ++++++++++++++++++++++++++----------
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1 file changed, 26 insertions(+), 10 deletions(-)
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diff --git a/gv.c b/gv.c
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index 07709a0..3237c53 100644
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--- a/gv.c
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+++ b/gv.c
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@@ -1010,7 +1010,6 @@ Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN le
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{
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const char * const origname = name;
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const char * const name_end = name + len;
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- const char *nend;
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const char *last_separator = NULL;
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GV* gv;
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HV* ostash = stash;
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@@ -1029,16 +1028,33 @@ Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN le
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the error reporting code. */
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}
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- for (nend = name; *nend || nend != name_end; nend++) {
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- if (*nend == '\'') {
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- last_separator = nend;
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- name = nend + 1;
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- }
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- else if (*nend == ':' && *(nend + 1) == ':') {
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- last_separator = nend++;
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- name = nend + 1;
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- }
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+ {
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+ /* check if the method name is fully qualified or
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+ * not, and separate the package name from the actual
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+ * method name.
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+ *
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+ * leaves last_separator pointing to the beginning of the
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+ * last package separator (either ' or ::) or 0
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+ * if none was found.
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+ *
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+ * leaves name pointing at the beginning of the
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+ * method name.
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+ */
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+ const char *name_cursor = name;
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+ const char * const name_em1 = name_end - 1; /* name_end minus 1 */
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+ for (name_cursor = name; name_cursor < name_end ; name_cursor++) {
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+ if (*name_cursor == '\'') {
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+ last_separator = name_cursor;
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+ name = name_cursor + 1;
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+ }
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+ else if (name_cursor < name_em1 && *name_cursor == ':' && name_cursor[1] == ':') {
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+ last_separator = name_cursor++;
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+ name = name_cursor + 1;
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+ }
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+ }
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}
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+
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+ /* did we find a separator? */
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if (last_separator) {
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if ((last_separator - origname) == 5 && memEQ(origname, "SUPER", 5)) {
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/* ->SUPER::method should really be looked up in original stash */
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--
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2.7.4
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