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video: fbdev: fbcvt.c: fix printing in fb_cvt_print_name()

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[ Upstream commit 78482af095abd9f4f29f1aa3fe575d25c6ae3028 ]

This code has two bugs:
1) "cnt" is 255 but the size of the buffer is 256 so the last byte is
   not used.
2) If we try to print more than 255 characters then "cnt" will be
   negative and that will trigger a WARN() in snprintf(). The fix for
   this is to use scnprintf() instead of snprintf().

We can re-write this code to be cleaner:
1) Rename "offset" to "off" because that's shorter.
2) Get rid of the "cnt" variable and just use "size - off" directly.
3) Get rid of the "read" variable and just increment "off" directly.

Fixes: 96fe6a2109 ("fbdev: Add VESA Coordinated Video Timings (CVT) support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2021-09-16 16:29:19 +03:00 committed by Greg Kroah-Hartman
parent 125d10f0be
commit 547d36fa41
1 changed files with 20 additions and 31 deletions
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51
drivers/video/fbdev/core/fbcvt.c
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@ -214,9 +214,11 @@ static u32 fb_cvt_aspect_ratio(struct fb_cvt_data *cvt)
static void fb_cvt_print_name(struct fb_cvt_data *cvt)
{
u32 pixcount, pixcount_mod;
int cnt = 255, offset = 0, read = 0;
u8 *buf = kzalloc(256, GFP_KERNEL);
int size = 256;
int off = 0;
u8 *buf;
buf = kzalloc(size, GFP_KERNEL);
if (!buf)
return;
@ -224,43 +226,30 @@ static void fb_cvt_print_name(struct fb_cvt_data *cvt)
pixcount_mod = (cvt->xres * (cvt->yres/cvt->interlace)) % 1000000;
pixcount_mod /= 1000;
read = snprintf(buf+offset, cnt, "fbcvt: %dx%d@%d: CVT Name - ",
cvt->xres, cvt->yres, cvt->refresh);
offset += read;
cnt -= read;
off += scnprintf(buf + off, size - off, "fbcvt: %dx%d@%d: CVT Name - ",
cvt->xres, cvt->yres, cvt->refresh);
if (cvt->status)
snprintf(buf+offset, cnt, "Not a CVT standard - %d.%03d Mega "
"Pixel Image\n", pixcount, pixcount_mod);
else {
if (pixcount) {
read = snprintf(buf+offset, cnt, "%d", pixcount);
cnt -= read;
offset += read;
}
if (cvt->status) {
off += scnprintf(buf + off, size - off,
"Not a CVT standard - %d.%03d Mega Pixel Image\n",
pixcount, pixcount_mod);
} else {
if (pixcount)
off += scnprintf(buf + off, size - off, "%d", pixcount);
read = snprintf(buf+offset, cnt, ".%03dM", pixcount_mod);
cnt -= read;
offset += read;
off += scnprintf(buf + off, size - off, ".%03dM", pixcount_mod);
if (cvt->aspect_ratio == 0)
read = snprintf(buf+offset, cnt, "3");
off += scnprintf(buf + off, size - off, "3");
else if (cvt->aspect_ratio == 3)
read = snprintf(buf+offset, cnt, "4");
off += scnprintf(buf + off, size - off, "4");
else if (cvt->aspect_ratio == 1 || cvt->aspect_ratio == 4)
read = snprintf(buf+offset, cnt, "9");
off += scnprintf(buf + off, size - off, "9");
else if (cvt->aspect_ratio == 2)
read = snprintf(buf+offset, cnt, "A");
else
read = 0;
cnt -= read;
offset += read;
off += scnprintf(buf + off, size - off, "A");
if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK) {
read = snprintf(buf+offset, cnt, "-R");
cnt -= read;
offset += read;
}
if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK)
off += scnprintf(buf + off, size - off, "-R");
}
printk(KERN_INFO "%s\n", buf);