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vtfontcvt: improve .bdf validation

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Previously if we had a FONTBOUNDINGBOX or DWIDTH entry that had missing
or invalid values and and failed sscanf, we would proceeded with
partially initialized bounding box / device width variables.

Reported by:	afl (FONTBOUNDINGBOX)
MFC with:	r349100
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Ed Maste 2019-06-24 17:25:14 +00:00
parent 51a7230a18
commit 2771ab3322
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=349333
1 changed files with 8 additions and 5 deletions
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13
usr.bin/vtfontcvt/vtfontcvt.c
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@ -335,9 +335,11 @@ parse_bdf(FILE *fp, unsigned int map_idx)
break;
}
}
} else if (strncmp(ln, "FONTBOUNDINGBOX ", 16) == 0 &&
sscanf(ln + 16, "%d %d %d %d", &fbbw, &fbbh, &fbbox,
&fbboy) == 4) {
} else if (strncmp(ln, "FONTBOUNDINGBOX ", 16) == 0) {
if (sscanf(ln + 16, "%d %d %d %d", &fbbw, &fbbh, &fbbox,
&fbboy) != 4)
errx(1, "invalid FONTBOUNDINGBOX at line %u",
linenum);
set_width(fbbw);
set_height(fbbh);
break;
@ -353,8 +355,9 @@ parse_bdf(FILE *fp, unsigned int map_idx)
linenum++;
ln[length - 1] = '\0';
if (strncmp(ln, "DWIDTH ", 7) == 0 &&
sscanf(ln + 7, "%d %d", &dwidth, &dwy) == 2) {
if (strncmp(ln, "DWIDTH ", 7) == 0) {
if (sscanf(ln + 7, "%d %d", &dwidth, &dwy) != 2)
errx(1, "invalid DWIDTH at line %u", linenum);
if (dwy != 0 || (dwidth != fbbw && dwidth * 2 != fbbw))
errx(1, "bitmap with unsupported DWIDTH %d %d at line %u",
dwidth, dwy, linenum);