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Message-ID: <20170914155051.8289-59-alexander.levin@verizon.com> Date: Thu, 14 Sep 2017 15:51:21 +0000 From: "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com> To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "stable@...r.kernel.org" <stable@...r.kernel.org> Cc: Juerg Haefliger <juerg.haefliger@....com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com> Subject: [PATCH for 4.9 59/59] lkdtm: Fix Oops when unloading the module From: Juerg Haefliger <juerg.haefliger@....com> [ 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@....com> Acked-by: Kees Cook <keescook@...omium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Signed-off-by: Sasha Levin <alexander.levin@...izon.com> --- drivers/misc/lkdtm_core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/misc/lkdtm_core.c b/drivers/misc/lkdtm_core.c index f9154b8d67f6..b2989f2d3126 100644 --- a/drivers/misc/lkdtm_core.c +++ b/drivers/misc/lkdtm_core.c @@ -533,7 +533,9 @@ static void __exit lkdtm_module_exit(void) /* 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"); } -- 2.11.0
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