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lingrid(), avoid buffer overflow 

Bug ID: `Buffer overflow detected - ID: 3510521'
    reported by Zsolt Makaró

  The variable `mag3' sometimes seems to take
    unexpected values
    (for example log10 can be -Inf, which will be casted to 0x80000000)
  and seems then to have overflown a buffer buf[LABEL_CHARS]
This commit is contained in:
rlar 2012-03-27 21:07:12 +02:00
parent 6e829f7cc4
commit e91e3c4ec7
1 changed files with 9 additions and 7 deletions
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16
src/frontend/plotting/grid.c
View File

@ -331,8 +331,6 @@ lingrid(GRAPH *graph, double lo, double hi, double delta, int type, Axis axis)
tenpowmag = pow(10.0, (double) mag3);
*buf = 0;
i = (mag3 + 18) / 3;
if (i < 0)
@ -349,24 +347,28 @@ lingrid(GRAPH *graph, double lo, double hi, double delta, int type, Axis axis)
else if (j == 2)
(void) sprintf(buf, "x100 ");
else if (j)
(void) sprintf(buf, "x10^%d ", j);
(void) snprintf(buf, sizeof(buf) - 1, "x10^%d ", j);
else
buf[0] = '\0';
if (scaleletters[i]) {
for (p = buf; *p; p++)
;
*p++ = scaleletters[i];
*p++ = 0;
*p++ = '\0';
}
} else if (mag > 1) {
tenpowmag = pow(10.0, (double) mag);
(void) sprintf(buf, "x10^%d ", mag);
(void) snprintf(buf, sizeof(buf), "x10^%d ", mag);
} else {
buf[0] = '\0';
}
if ((s = ft_typabbrev(type)) != NULL) {
(void) strcat(buf, s);
(void) strncat(buf, s, sizeof(buf) - 1);
} else {
(void) strcat(buf, "Units");
(void) strncat(buf, "Units", sizeof(buf) - 1);
}
if (delta == 0.0) {