acpi/apei/erst: Add missing iounmap() on error in erst_exec_move_data()

Add the missing iounmap() before return from erst_exec_move_data()
in the error handling case.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index 88d0b0f9f92b..6885809abcd8 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -284,8 +284,10 @@ static int erst_exec_move_data(struct apei_exec_context *ctx,
         if (!src)
                 return -ENOMEM;
         dst = ioremap(ctx->dst_base + offset, ctx->var2);
-        if (!dst)
+        if (!dst) {
+                iounmap(src);
                 return -ENOMEM;
+        }
 
         memmove(dst, src, ctx->var2);