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Subject[PATCH 4.9 057/104] lkdtm: Fix Oops when unloading the module
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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Juerg Haefliger <juerg.haefliger@hpe.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@hpe.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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");
}


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