[PATCH] segfault in imsm create with wrong arguments

[Luca Berra <bluca@comedia.it>]

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When calling mdadm -C --metadata=imsm -l 1 /dev/sd..
mdadm segfaults in default_chunk_imsm()
above syntax is incorrect, but mdadm should error instead of segfaulting

-- 
Luca Berra -- bluca@comedia.it

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When calling mdadm -C --metadata=imsm -l 1 /dev/sd..
mdadm segfaults in default_chunk_imsm()
above syntax is incorrect, but mdadm should error instead of segfaulting

Signed-off-by: Luca Berra <bluca@comedia.it>

diff -p -up mdadm-3.1.4/super-intel.c.bluca mdadm-3.1.4/super-intel.c
--- mdadm-3.1.4/super-intel.c.bluca	2010-08-26 02:24:16.000000000 +0000
+++ mdadm-3.1.4/super-intel.c	2010-12-12 11:13:00.024371004 +0000
@@ -4119,7 +4119,7 @@ static int default_chunk_imsm(struct sup
 {
 	struct intel_super *super = st->sb;
 
-	if (!super->orom)
+	if (!super || !super->orom)
 		return 0;
 
 	return imsm_orom_default_chunk(super->orom);