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Message-Id: <1441882323-18557-1-git-send-email-sudipm.mukherjee@gmail.com> Date: Thu, 10 Sep 2015 16:22:03 +0530 From: Sudip Mukherjee <sudipm.mukherjee@...il.com> To: Dimitri Sivanich <sivanich@....com>, Arnd Bergmann <arnd@...db.de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: linux-kernel@...r.kernel.org, Sudip Mukherjee <sudipm.mukherjee@...il.com> Subject: [PATCH] drivers/misc/sgi-gru: fix possible NULL dereference If mmu_find_ops() returns NULL then we are allocating memory for gms using kzalloc. But kzalloc can return NULL and we were dereferencing gms in gru_dbg(). Signed-off-by: Sudip Mukherjee <sudip@...torindia.org> --- drivers/misc/sgi-gru/grutlbpurge.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/misc/sgi-gru/grutlbpurge.c b/drivers/misc/sgi-gru/grutlbpurge.c index 2129274..757a8e9 100644 --- a/drivers/misc/sgi-gru/grutlbpurge.c +++ b/drivers/misc/sgi-gru/grutlbpurge.c @@ -317,8 +317,9 @@ struct gru_mm_struct *gru_register_mmu_notifier(void) goto error; } } - gru_dbg(grudev, "gms %p, refcnt %d\n", gms, - atomic_read(&gms->ms_refcnt)); + if (gms) + gru_dbg(grudev, "gms %p, refcnt %d\n", gms, + atomic_read(&gms->ms_refcnt)); return gms; error: kfree(gms); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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