linux-kernel - [PATCH v2 1/5] drm/modes: parse_cmdline: Handle empty mode name part

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Message-Id: <302d0737539daa2053134e8f24fdf37e3d939e1e.1657788997.git.geert@linux-m68k.org>
Date:   Thu, 14 Jul 2022 11:04:06 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Hans de Goede <hdegoede@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH v2 1/5] drm/modes: parse_cmdline: Handle empty mode name part

If no mode name part was specified, mode_end is zero, and the "ret ==
mode_end" check does the wrong thing.

Fix this by skipping all named mode handling when mode_end is zero.

Fixes: 7b1cce760afe38b4 ("drm/modes: parse_cmdline: Allow specifying stand-alone options")
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Acked-by: Thomas Zimmermann <tzimmermann@...e.de>
---
v2:
  - Add Reviewed-by, Acked-by,
  - Keep "ret == mode_end" check.
---
 drivers/gpu/drm/drm_modes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 14b746f7ba975954..67773740c74c9ba0 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1823,7 +1823,7 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
 	}
 
 	/* First check for a named mode */
-	for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
+	for (i = 0; mode_end && i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
 		ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
 		if (ret == mode_end) {
 			if (refresh_ptr)
-- 
2.25.1