linux-kernel - [PATCH v2 048/101] fbdev/neofb: Duplicate video-mode option string

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Message-Id: <20230309160201.5163-49-tzimmermann@suse.de>
Date:   Thu,  9 Mar 2023 17:01:08 +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 048/101] fbdev/neofb: 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/neofb.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/neofb.c b/drivers/video/fbdev/neofb.c
index 39d8cdef5c97..98edb6822832 100644
--- a/drivers/video/fbdev/neofb.c
+++ b/drivers/video/fbdev/neofb.c
@@ -83,6 +83,7 @@ static bool external;
 static bool libretto;
 static bool nostretch;
 static bool nopciburst;
+static char *mode_option_buf;
 static char *mode_option = NULL;
 
 #ifdef MODULE
@@ -2198,8 +2199,11 @@ static int __init neofb_setup(char *options)
 			nopciburst = 1;
 		else if (!strncmp(this_opt, "libretto", 8))
 			libretto = 1;
-		else
-			mode_option = this_opt;
+		else {
+			kfree(mode_option_buf);
+			mode_option_buf = kstrdup(this_opt, GFP_KERNEL); // ignore errors
+			mode_option = mode_option_buf;
+		}
 	}
 	return 0;
 }
@@ -2228,6 +2232,7 @@ module_init(neofb_init);
 static void __exit neofb_exit(void)
 {
 	pci_unregister_driver(&neofb_driver);
+	kfree(mode_option_buf);
 }
 
 module_exit(neofb_exit);
-- 
2.39.2