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Add overflow checks: if output size becomes bigger than INT_MAX, 

just return EOF
This commit is contained in:
Andrey A. Chernov 1997-12-25 00:32:17 +00:00
parent fb25537fb8
commit 92e88f87b9
1 changed files with 13 additions and 2 deletions
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15
lib/libc/stdio/vfprintf.c
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@ -39,7 +39,7 @@
static char sccsid[] = "@(#)vfprintf.c 8.1 (Berkeley) 6/4/93";
#endif
static const char rcsid[] =
"$Id: vfprintf.c,v 1.14 1997/12/24 13:47:13 ache Exp $";
"$Id: vfprintf.c,v 1.15 1997/12/24 23:02:43 ache Exp $";
#endif /* LIBC_SCCS and not lint */
/*
@ -320,6 +320,7 @@ vfprintf(fp, fmt0, ap)
int dprec; /* a copy of prec if [diouxX], 0 otherwise */
int realsz; /* field size expanded by dprec, sign, etc */
int size; /* size of converted field or string */
int prsize; /* max size of printed field */
char *xdigs; /* digits for [xX] conversion */
#define NIOV 8
struct __suio uio; /* output information: summary */
@ -456,6 +457,10 @@ vfprintf(fp, fmt0, ap)
for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
/* void */;
if ((n = fmt - cp) != 0) {
if ((size_t)ret + n > INT_MAX) {
ret = EOF;
goto error;
}
PRINT(cp, n);
ret += n;
}
@ -780,6 +785,12 @@ number: if ((dprec = prec) >= 0)
else if (flags & HEXPREFIX)
realsz += 2;
prsize = width > realsz ? width : realsz;
if ((size_t)ret + prsize > INT_MAX) {
ret = EOF;
goto error;
}
/* right-adjusting blank padding */
if ((flags & (LADJUST|ZEROPAD)) == 0)
PAD(width - realsz, blanks);
@ -853,7 +864,7 @@ number: if ((dprec = prec) >= 0)
PAD(width - realsz, blanks);
/* finally, adjust ret */
ret += width > realsz ? width : realsz;
ret += prsize;
FLUSH(); /* copy out the I/O vectors */
}