linux-kernel - [PATCH v2 080/101] fbdev/tdfxfb: Duplicate video-mode option string

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Message-Id: <20230309160201.5163-81-tzimmermann@suse.de>
Date:   Thu,  9 Mar 2023 17:01:40 +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 080/101] fbdev/tdfxfb: 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/tdfxfb.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/tdfxfb.c b/drivers/video/fbdev/tdfxfb.c
index d17e5e1472aa..ccce6dac443d 100644
--- a/drivers/video/fbdev/tdfxfb.c
+++ b/drivers/video/fbdev/tdfxfb.c
@@ -150,6 +150,7 @@ MODULE_DEVICE_TABLE(pci, tdfxfb_id_table);
 static int nopan;
 static int nowrap = 1;      /* not implemented (yet) */
 static int hwcursor = 1;
+static char *mode_option_buf;
 static char *mode_option;
 static bool nomtrr;
 
@@ -1589,7 +1590,9 @@ static void __init tdfxfb_setup(char *options)
 		} else if (!strncmp(this_opt, "nomtrr", 6)) {
 			nomtrr = 1;
 		} else {
-			mode_option = this_opt;
+			kfree(mode_option_buf);
+			mode_option_buf = kstrdup(this_opt, GFP_KERNEL); // ignore errors
+			mode_option = mode_option_buf;
 		}
 	}
 }
@@ -1649,6 +1652,7 @@ static int __init tdfxfb_init(void)
 static void __exit tdfxfb_exit(void)
 {
 	pci_unregister_driver(&tdfxfb_driver);
+	kfree(mode_option_buf);
 }
 
 MODULE_AUTHOR("Hannu Mallat <hmallat@...hut.fi>");
-- 
2.39.2