[PATCH v2] i2c: busses/i2c-pxa.c: fix potential null pointerdereference error

[Cong Ding]

If it goes to eclk through line 1107, the variable res would be NULL. It will
cause a null pointer dereference error if we call release_mem_region.

Signed-off-by: Cong Ding <dinggnu@xxxxxxxxx>
---
 drivers/i2c/busses/i2c-pxa.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index 1034d93..00df535 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -1211,7 +1211,8 @@ eremap:
 eclk:
 	kfree(i2c);
 emalloc:
-	release_mem_region(res->start, resource_size(res));
+	if (res)
+		release_mem_region(res->start, resource_size(res));
 	return ret;
 }
 
-- 
1.7.9.5

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