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[v2,037/101] fbdev/intelfb: Duplicate video-mode option string

Message ID 20230309160201.5163-38-tzimmermann@suse.de
State New
Headers
Series fbdev: Fix memory leak in option parsing |

Commit Message

Thomas Zimmermann March 9, 2023, 4 p.m. UTC 
  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@suse.de>
---
 drivers/video/fbdev/intelfb/intelfbdrv.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/video/fbdev/intelfb/intelfbdrv.c b/drivers/video/fbdev/intelfb/intelfbdrv.c
index 0a9e5067b201..8368c3601cdb 100644
--- a/drivers/video/fbdev/intelfb/intelfbdrv.c
+++ b/drivers/video/fbdev/intelfb/intelfbdrv.c
@@ -238,6 +238,7 @@  static bool probeonly   = 0;
 static bool idonly      = 0;
 static int bailearly    = 0;
 static int voffset	= 48;
+static char *mode_buf;
 static char *mode       = NULL;
 
 module_param(accel, bool, S_IRUGO);
@@ -365,8 +366,11 @@  static int __init intelfb_setup(char *options)
 			noinit = !noinit;
 		else if (OPT_EQUAL(this_opt, "mode="))
 			mode = get_opt_string(this_opt, "mode=");
-		else
-			mode = this_opt;
+		else {
+			kfree(mode_buf);
+			mode_buf = kstrdup(this_opt, GFP_KERNEL); // ignore errors
+			mode = mode_buf;
+		}
 	}
 
 	return 0;
@@ -405,6 +409,7 @@  static void __exit intelfb_exit(void)
 {
 	DBG_MSG("intelfb_exit\n");
 	pci_unregister_driver(&intelfb_driver);
+	kfree(mode_buf);
 }
 
 module_init(intelfb_init);