linux-kernel - [PATCH][next] afs: fix double kfree on cell

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Message-Id: <20200602153505.64714-1-colin.king@canonical.com>
Date:   Tue,  2 Jun 2020 16:35:05 +0100
From:   Colin King <colin.king@...onical.com>
To:     David Howells <dhowells@...hat.com>, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org
Subject: [PATCH][next] afs: fix double kfree on cell_name on error exit path

From: Colin Ian King <colin.king@...onical.com>

The error exit path is currently kfree'ing cell_name for a second time,
the previous kfree of this object occurred a statement earlier. Fix this
by removing it.

Addresses-Coverity: ("Double free")
Fixes: 6147fe6b7f8c ("afs: Detect cell aliases 3 - YFS Cells with a canonical cell name op")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 fs/afs/vl_alias.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/afs/vl_alias.c b/fs/afs/vl_alias.c
index 6c1cf702478e..093895c49c21 100644
--- a/fs/afs/vl_alias.c
+++ b/fs/afs/vl_alias.c
@@ -315,10 +315,8 @@ static int yfs_check_canonical_cell_name(struct afs_cell *cell, struct key *key)
 	master = afs_lookup_cell(cell->net, cell_name, strlen(cell_name),
 				 NULL, false);
 	kfree(cell_name);
-	if (IS_ERR(master)) {
-		kfree(cell_name);
+	if (IS_ERR(master))
 		return PTR_ERR(master);
-	}
 
 	cell->alias_of = master; /* Transfer our ref */
 	return 1;
-- 
2.25.1