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https://dev.gnupg.org/T6027
https://www.openwall.com/lists/oss-security/2022/06/30/1
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=commit;h=34c649b3601383cd11dbc76221747ec16fd68e1b
From 34c649b3601383cd11dbc76221747ec16fd68e1b Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Tue, 14 Jun 2022 11:33:27 +0200
Subject: [PATCH] g10: Fix garbled status messages in NOTATION_DATA
* g10/cpr.c (write_status_text_and_buffer): Fix off-by-one
--
Depending on the escaping and line wrapping the computed remaining
buffer length could be wrong. Fixed by always using a break to
terminate the escape detection loop. Might have happened for all
status lines which may wrap.
GnuPG-bug-id: T6027
---
g10/cpr.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
diff --git a/g10/cpr.c b/g10/cpr.c
index 9bfdd3c34..fa8005d6f 100644
--- a/g10/cpr.c
+++ b/g10/cpr.c
@@ -372,20 +372,15 @@ write_status_text_and_buffer (int no, const char *string,
}
first = 0;
}
- for (esc=0, s=buffer, n=len; n && !esc; s++, n--)
+ for (esc=0, s=buffer, n=len; n; s++, n--)
{
if (*s == '%' || *(const byte*)s <= lower_limit
|| *(const byte*)s == 127 )
esc = 1;
if (wrap && ++count > wrap)
- {
- dowrap=1;
- break;
- }
- }
- if (esc)
- {
- s--; n++;
+ dowrap=1;
+ if (esc || dowrap)
+ break;
}
if (s != buffer)
es_fwrite (buffer, s-buffer, 1, statusfp);
--
2.11.0
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