linux-kernel - [PATCH v2 052/101] fbdev/ocfb: Duplicate video-mode option string

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Message-Id: <20230309160201.5163-53-tzimmermann@suse.de>
Date:   Thu,  9 Mar 2023 17:01:12 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     deller@....de, geert+renesas@...der.be, timur@...nel.org,
        rdunlap@...radead.org, paulus@...ba.org, benh@...nel.crashing.org,
        linux@...linux.org.uk, pjones@...hat.com, adaplas@...il.com,
        s.hauer@...gutronix.de, shawnguo@...nel.org, mbroemme@...mpq.org,
        thomas@...ischhofer.net, James.Bottomley@...senPartnership.com,
        sudipm.mukherjee@...il.com, teddy.wang@...iconmotion.com,
        corbet@....net
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>
Subject: [PATCH v2 052/101] fbdev/ocfb: Duplicate video-mode option string

Assume that the driver does not own the option string or its substrings
and hence duplicate the option string for the video mode. Allocate the
copy's memory with kstrdup() and free it in the module's exit function.

Done in preparation of switching the driver to struct option_iter and
constifying the option string.

v2:
	* replace static memory with kstrdup()/kfree() (Geert)

Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
---
 drivers/video/fbdev/ocfb.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/ocfb.c b/drivers/video/fbdev/ocfb.c
index da7e1457e58f..9786c3641448 100644
--- a/drivers/video/fbdev/ocfb.c
+++ b/drivers/video/fbdev/ocfb.c
@@ -47,6 +47,7 @@
 
 #define OCFB_NAME	"OC VGA/LCD"
 
+static char *mode_option_buf;
 static char *mode_option;
 
 static const struct fb_videomode default_mode = {
@@ -77,7 +78,10 @@ static int __init ocfb_setup(char *options)
 	while ((curr_opt = strsep(&options, ",")) != NULL) {
 		if (!*curr_opt)
 			continue;
-		mode_option = curr_opt;
+
+		kfree(mode_option_buf);
+		mode_option_buf = kstrdup(curr_opt, GFP_KERNEL); // ignore errors
+		mode_option = mode_option_buf;
 	}
 
 	return 0;
@@ -420,6 +424,7 @@ static int __init ocfb_init(void)
 static void __exit ocfb_exit(void)
 {
 	platform_driver_unregister(&ocfb_driver);
+	kfree(mode_option_buf);
 }
 
 module_init(ocfb_init);
-- 
2.39.2