phb4: Handle allocation errors in phb4_eeh_dump_regs()

If the zalloc fails (and it can be a rather large allocation),
we will overwite memory at 0 instead of failing.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/hw/phb4.c b/hw/phb4.c
index 01efd14a..fbf54b5b 100644
--- a/hw/phb4.c
+++ b/hw/phb4.c
@@ -2072,6 +2072,10 @@ static void phb4_eeh_dump_regs(struct phb4 *p)
 		return;
 
 	s = zalloc(sizeof(struct OpalIoPhb4ErrorData));
+	if (!s) {
+		PHBERR(p, "Failed to allocate error info !\n");
+		return;
+	}
 	phb4_read_phb_status(p, s);