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* [newlib-cygwin/main] Cygwin: mbrtowi: fix segfault when pwi is NULL
@ 2023-04-19 8:16 Corinna Vinschen
0 siblings, 0 replies; only message in thread
From: Corinna Vinschen @ 2023-04-19 8:16 UTC (permalink / raw)
To: cygwin-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=53f7fb20a064fec180291a497d11eb66fe6172e6
commit 53f7fb20a064fec180291a497d11eb66fe6172e6
Author: David McFarland <corngood@gmail.com>
AuthorDate: Tue Apr 18 17:05:34 2023 -0300
Commit: Corinna Vinschen <corinna@vinschen.de>
CommitDate: Wed Apr 19 10:14:46 2023 +0200
Cygwin: mbrtowi: fix segfault when pwi is NULL
mbrtowi was missing null-checks on pwi, but NULL is passed from
regex/engine.c:173.
In a git repo with sendemail.smtpserver set, this results in a segfault when
using git-send-email, which calls:
git config --get-regexp '^sende?mail[.]'
Fixes: 60c25da90d01 ("Cygwin: mbrtowi: define replacement for mbrtowc, returning UTF-32 value")
Signed-off-by: David McFarland <corngood@gmail.com>
Diff:
---
winsup/cygwin/strfuncs.cc | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/winsup/cygwin/strfuncs.cc b/winsup/cygwin/strfuncs.cc
index 57abf25649ec..76b7216cc3a2 100644
--- a/winsup/cygwin/strfuncs.cc
+++ b/winsup/cygwin/strfuncs.cc
@@ -159,7 +159,8 @@ mbrtowi (wint_t *pwi, const char *s, size_t n, mbstate_t *ps)
len = mbrtowc (&w1, s, n, ps);
if (len == (size_t) -1 || len == (size_t) -2)
return len;
- *pwi = w1;
+ if (pwi)
+ *pwi = w1;
/* Convert surrogate pair to wint_t value */
if (len > 0 && w1 >= 0xd800 && w1 <= 0xdbff)
{
@@ -169,7 +170,8 @@ mbrtowi (wint_t *pwi, const char *s, size_t n, mbstate_t *ps)
if (len2 > 0 && w2 >= 0xdc00 && w2 <= 0xdfff)
{
len += len2;
- *pwi = (((w1 & 0x3ff) << 10) | (w2 & 0x3ff)) + 0x10000;
+ if (pwi)
+ *pwi = (((w1 & 0x3ff) << 10) | (w2 & 0x3ff)) + 0x10000;
}
else
{
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