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drivers/misc/sgi-gru: fix possible NULL dereference

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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@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudip Mukherjee 2015-09-10 16:22:03 +05:30 committed by Greg Kroah-Hartman
parent 6894fdaeaa
commit f97ef75999
1 changed files with 3 additions and 2 deletions
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5
drivers/misc/sgi-gru/grutlbpurge.c
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@ -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);