My latest commit introduce some case where a valid mode, could be
rejected.
simple_strtox functions stop at first non-digit character, but kstrtox not.
So args like "video=HDMI-A-1:720x480-16 at 60" will be reject when checking 16
at .
The proper solution is to store digits in a specific buffer.
Fixes: 52157a4ca396 ("drm: modes: replace simple_strtoul by kstrtouint")
Reported-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
Signed-off-by: LABBE Corentin <clabbe.montjoie at gmail.com>
---
drivers/gpu/drm/drm_modes.c | 28 +++++++++++++++++++++-------
1 file changed, 21 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index bde9b29..da1e80d 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1225,13 +1225,14 @@ bool drm_mode_parse_command_line_for_connector(const
char *mode_option,
struct drm_cmdline_mode *mode)
{
const char *name;
- unsigned int namelen;
+ unsigned int namelen, digit_i;
bool res_specified = false, bpp_specified = false, refresh_specified =
false;
unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
bool yres_specified = false, cvt = false, rb = false;
bool interlace = false, margins = false, was_digit = false;
int i, err;
enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
+ char *digits;
#ifdef CONFIG_FB
if (!mode_option)
@@ -1245,42 +1246,53 @@ bool drm_mode_parse_command_line_for_connector(const
char *mode_option,
name = mode_option;
namelen = strlen(name);
+
+ digits = kzalloc(namelen, GFP_KERNEL);
+ if (!digits)
+ return false;
+ /* The last character must be the last 0 */
+ digit_i = namelen;
+
for (i = namelen-1; i >= 0; i--) {
switch (name[i]) {
case '@':
if (!refresh_specified && !bpp_specified &&
!yres_specified && !cvt && !rb && was_digit) {
- err = kstrtouint(&name[i + 1], 10, &refresh);
+ err = kstrtouint(&digits[digit_i], 10,
&refresh);
if (err)
- return false;
+ goto done;
refresh_specified = true;
was_digit = false;
+ digit_i = namelen;
} else
goto done;
break;
case '-':
if (!bpp_specified && !yres_specified && !cvt &&
!rb && was_digit) {
- err = kstrtouint(&name[i + 1], 10, &bpp);
+ err = kstrtouint(&digits[digit_i], 10, &bpp);
if (err)
- return false;
+ goto done;
bpp_specified = true;
was_digit = false;
+ digit_i = namelen;
} else
goto done;
break;
case 'x':
if (!yres_specified && was_digit) {
- err = kstrtouint(&name[i + 1], 10, &yres);
+ err = kstrtouint(&digits[digit_i], 10, &yres);
if (err)
- return false;
+ goto done;
yres_specified = true;
was_digit = false;
+ digit_i = namelen;
} else
goto done;
break;
case '0' ... '9':
was_digit = true;
+ digits[--digit_i] = name[i];
break;
case 'M':
if (yres_specified || cvt || was_digit)
@@ -1349,6 +1361,7 @@ done:
"parse error at position %i in video mode '%s'\n",
i, name);
mode->specified = false;
+ kfree(digits);
return false;
}
@@ -1373,6 +1386,7 @@ done:
mode->margins = margins;
mode->force = force;
+ kfree(digits);
return true;
}
EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
--
2.4.10
