drm/modes: Use strscpy() to copy command-line mode name

The mode name in struct drm_cmdline_mode can hold 32 characters at most,
which can easily get overrun. Switch to strscpy() to prevent such a
thing.

Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1527354 ("Security best practices violations")
Fixes: a7ab155397dd ("drm/modes: Switch to named mode descriptors")
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20221128081938.742410-2-maxime@cerno.tech
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 699c66e..be030f4 100644 (file)
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -2316,7 +2316,7 @@ static int drm_mode_parse_cmdline_named_mode(const char *name,
                if (ret != name_end)
                        continue;
 
-               strcpy(cmdline_mode->name, mode->name);
+               strscpy(cmdline_mode->name, mode->name, sizeof(cmdline_mode->name));
                cmdline_mode->pixel_clock = mode->pixel_clock_khz;
                cmdline_mode->xres = mode->xres;
                cmdline_mode->yres = mode->yres;