From: 黎伟强 <414256we@gmail.com>
To: ecos-maintainers <ecos-maintainers@ecos.sourceware.org>
Subject: Bugs in vfscanf.cxx(eCos)
Date: Fri, 20 Nov 2015 02:41:00 -0000 [thread overview]
Message-ID: <CAHLYy6pVz8gQdQ-uv9_vNhSXYrrWw2C85uij6=G82vX79ECpuA@mail.gmail.com> (raw)
Problem:
vfscanf have problem to deal with string in utf-8 format.
Analyze:
In function:
externC int
vfscanf (FILE *fp, const char *fmt0, va_list ap) __THROW {
u_char *fmt = (u_char *) fmt0;
It declared that:
char ccltab[256];
char curr_byte;
When a byte's highest bit(the sign bit) is set, doing the
following conversion:
(int)*CURR_POS
it surely will generates an integer that is larger than 256(
Recall, signed bit extension).
While try to combine it with:
ccltab[(int)*CURR_POS])
a fairly bug yields.
reply other threads:[~2015-11-20 2:41 UTC|newest]
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