[PATCH 08/99] fbdev/arkfb: Duplicate video-mode option string
From: Thomas Zimmermann <tzimmermann@suse.de>
Date: 2023-03-06 16:01:13
Also in:
dri-devel, lkml
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
Assume that the driver does not own the option string or its substrings and hence duplicate the option string for the video mode. The driver only parses the option string once as part of module initialization, so use a static buffer to store the duplicated mode option. Linux automatically frees the memory upon releasing the module. Done in preparation of constifying the option string. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> --- drivers/video/fbdev/arkfb.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/video/fbdev/arkfb.c b/drivers/video/fbdev/arkfb.c
index 60a96fdb5dd8..f83fcdaec7a0 100644
--- a/drivers/video/fbdev/arkfb.c
+++ b/drivers/video/fbdev/arkfb.c@@ -1196,8 +1196,17 @@ static int __init arkfb_init(void) if (fb_get_options("arkfb", &option)) return -ENODEV; - if (option && *option) - mode_option = option; + if (option && *option) { + static char mode_option_buf[256]; + int ret; + + ret = snprintf(mode_option_buf, sizeof(mode_option_buf), "%s", option); + if (WARN(ret < 0, "arkfb: ignoring invalid option, ret=%d\n", ret)) + continue; + if (WARN(ret >= sizeof(mode_option_buf), "arkfb: option too long\n")) + continue; + mode_option = mode_option_buf; + } #endif pr_debug("arkfb: initializing\n");
--
2.39.2