linux-kernel - [PATCH] pstore: Fix leaked pstore_record in pstore_get_backend

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Message-Id: <20170530225038.21604-1-dianders@chromium.org>
Date:   Tue, 30 May 2017 15:50:38 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     keescook@...omium.org
Cc:     Douglas Anderson <dianders@...omium.org>, anton@...msg.org,
        ccross@...roid.com, Tony Luck <tony.luck@...el.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] pstore: Fix leaked pstore_record in pstore_get_backend_records()

When the "if (record->size <= 0)" test is true in
pstore_get_backend_records() it's pretty clear that nobody holds a
reference to the allocated pstore_record, yet we don't free it.

Let's free it.

Fixes: 2a2b0acf768c ("pstore: Allocate records on heap instead of stack")
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---
 fs/pstore/platform.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index d468eec9b8a6..9defe98ff8b1 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -846,8 +846,10 @@ void pstore_get_backend_records(struct pstore_info *psi,
 		record->size = psi->read(record);
 
 		/* No more records left in backend? */
-		if (record->size <= 0)
+		if (record->size <= 0) {
+			kfree(record);
 			break;
+		}
 
 		decompress_record(record);
 		rc = pstore_mkfile(root, record);
-- 
2.13.0.219.gdb65acc882-goog