linux-kernel - [PATCH] powerpc/pseries: Fix potential memleak in papr_get

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Date:   Thu, 8 Dec 2022 21:34:49 +0800
From:   Qiheng Lin <linqiheng@...wei.com>
To:     <mpe@...erman.id.au>, <npiggin@...il.com>,
        <christophe.leroy@...roup.eu>
CC:     <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
        <linqiheng@...wei.com>
Subject: [PATCH] powerpc/pseries: Fix potential memleak in papr_get_attr()

`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 <linqiheng@...wei.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