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Code Issues Releases Activity

Fix computation of the 'n' argument to mbrtowc (through XMBRTOWC) to avoid

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reading past 'stop' in various places when converting multibyte characters.
Reading too far caused truncation to not be detected when it should have
been, eventually causing regexec() to loop infinitely in with certain
combinations of patterns and strings in multibyte locales.

PR:		74020
MFC after:	4 weeks
This commit is contained in:
Tim J. Robbins 2004-11-21 03:14:32 +00:00
parent ed0cf68945
commit bd9643b135
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=137959
1 changed files with 4 additions and 4 deletions
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8
lib/libc/regex/engine.c
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@ -331,7 +331,7 @@ int eflags;
NOTE("false alarm");
/* recycle starting later */
start = m->coldp + XMBRTOWC(NULL, m->coldp,
m->endp - m->coldp, &m->mbs, 0);
stop - m->coldp, &m->mbs, 0);
assert(start <= stop);
}
@ -807,7 +807,7 @@ sopno stopst;
if (p == m->endp)
c = OUT;
else
clen = XMBRTOWC(&c, p, m->endp - p, &m->mbs, BADCHAR);
clen = XMBRTOWC(&c, p, stop - p, &m->mbs, BADCHAR);
if (EQ(st, fresh))
coldp = p;
@ -861,7 +861,7 @@ sopno stopst;
assert(coldp != NULL);
m->coldp = coldp;
if (ISSET(st, stopst))
return(p+XMBRTOWC(NULL, p, m->endp - p, &m->mbs, 0));
return(p+XMBRTOWC(NULL, p, stop - p, &m->mbs, 0));
else
return(NULL);
}
@ -913,7 +913,7 @@ sopno stopst;
c = OUT;
clen = 0;
} else
clen = XMBRTOWC(&c, p, m->endp - p, &m->mbs, BADCHAR);
clen = XMBRTOWC(&c, p, stop - p, &m->mbs, BADCHAR);
/* is there an EOL and/or BOL between lastc and c? */
flagch = '\0';