This is a note to let you know that I've just added the patch titled lkdtm: Fix Oops when unloading the module to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: lkdtm-fix-oops-when-unloading-the-module.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Thu Oct 5 10:28:31 CEST 2017 From: Juerg Haefliger <juerg.haefliger@xxxxxxx> Date: Thu, 19 Jan 2017 11:40:13 +0100 Subject: lkdtm: Fix Oops when unloading the module From: Juerg Haefliger <juerg.haefliger@xxxxxxx> [ Upstream commit 9ba60573638e2006170ebcc5489fb1e068afbc8f ] No jprobe is registered when the module is loaded without specifying a crashpoint that uses a jprobe. At the moment, we unconditionally try to unregister the jprobe on module unload which results in an Oops. Add a check to fix this. Signed-off-by: Juerg Haefliger <juerg.haefliger@xxxxxxx> Acked-by: Kees Cook <keescook@xxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/misc/lkdtm_core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/misc/lkdtm_core.c +++ b/drivers/misc/lkdtm_core.c @@ -533,7 +533,9 @@ static void __exit lkdtm_module_exit(voi /* Handle test-specific clean-up. */ lkdtm_usercopy_exit(); - unregister_jprobe(lkdtm_jprobe); + if (lkdtm_jprobe != NULL) + unregister_jprobe(lkdtm_jprobe); + pr_info("Crash point unregistered\n"); } Patches currently in stable-queue which might be from juerg.haefliger@xxxxxxx are queue-4.9/lkdtm-fix-oops-when-unloading-the-module.patch