[PATCH] powerpc/pseries: Fix potential memleak in papr_get_attr()

[Qiheng Lin]

`buf` is allocated in papr_get_attr(), and krealloc() of `buf`
could fail. We need to free the original `buf` in the case of failure.

Fixes: 3c14b73454cf ("powerpc/pseries: Interface to represent PAPR firmware 
attributes")
Signed-off-by: Qiheng Lin <linqih...@huawei.com>
---
 arch/powerpc/platforms/pseries/papr_platform_attributes.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/papr_platform_attributes.c 
b/arch/powerpc/platforms/pseries/papr_platform_attributes.c
index 526c621b098b..eea2041b270b 100644
--- a/arch/powerpc/platforms/pseries/papr_platform_attributes.c
+++ b/arch/powerpc/platforms/pseries/papr_platform_attributes.c
@@ -101,10 +101,12 @@ static int papr_get_attr(u64 id, struct 
energy_scale_attribute *esi)
                esi_buf_size = ESI_HDR_SIZE + (CURR_MAX_ESI_ATTRS * 
max_esi_attrs);
 
                temp_buf = krealloc(buf, esi_buf_size, GFP_KERNEL);
-               if (temp_buf)
+               if (temp_buf) {
                        buf = temp_buf;
-               else
-                       return -ENOMEM;
+               } else {
+                       ret = -ENOMEM;
+                       goto out_buf;
+               }
 
                goto retry;
        }
-- 
2.32.0