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| author | Juerg Haefliger <juerg.haefliger@hpe.com> | 2017-01-19 11:40:13 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-25 11:41:44 +0100 |
| commit | 9ba60573638e2006170ebcc5489fb1e068afbc8f (patch) | |
| tree | 10eb014ff9804ecfccc1ea8974cb2fda6a3415d7 /drivers/misc | |
| parent | 8ade6039b8404a28a7f76eac37a92c464b69499a (diff) | |
| download | linux-9ba60573638e2006170ebcc5489fb1e068afbc8f.tar.gz linux-9ba60573638e2006170ebcc5489fb1e068afbc8f.tar.bz2 linux-9ba60573638e2006170ebcc5489fb1e068afbc8f.zip | |
lkdtm: Fix Oops when unloading the module
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>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/lkdtm_core.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/misc/lkdtm_core.c b/drivers/misc/lkdtm_core.c index 7eeb71a75549..4d44084071d8 100644 --- a/drivers/misc/lkdtm_core.c +++ b/drivers/misc/lkdtm_core.c @@ -535,7 +535,9 @@ 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"); } |