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powerpc: Protect against NULL pointer deref in phyp-dump code

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print_dump_header() will be called at least once with a NULL pointer in
a normal boot sequence.  If DEBUG is defined then we will dereference
the pointer and crash.  Add a quick fix to exit early in the NULL pointer
case.

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Acked-by: Manish Ahuja <mahujam@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Tony Breeds 2008-12-15 18:17:48 +00:00 committed by Paul Mackerras
parent 8168b5400b
commit 7a2eab0d4e
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/platforms/pseries/phyp_dump.c
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@ -130,6 +130,9 @@ static unsigned long init_dump_header(struct phyp_dump_header *ph)
static void print_dump_header(const struct phyp_dump_header *ph)
{
#ifdef DEBUG
if (ph == NULL)
return;
printk(KERN_INFO "dump header:\n");
/* setup some ph->sections required */
printk(KERN_INFO "version = %d\n", ph->version);