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Before this commit, if the last option of a video=... option is for example "rotate" without a "=<value>" after it then delim will point to the terminating 0 of the string, and value which is sets to <delim + 1> will point one position past the end of the string. This commit fixes this by enforcing that the contents of delim equals '=' as it should be for options which take a value, this check is done in a new drm_mode_parse_cmdline_int helper function which factors out the common integer parsing code for all the options which take an int. Acked-by: Maxime Ripard <mripard@kernel.org> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191118155134.30468-1-hdegoede@redhat.com