linux-kernel - [PATCH 4.9 021/121] mtd: cfi_cmdset_0002: dont free cfi->cfiq in error path of cfi_amdstd

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Date:   Tue, 29 Sep 2020 12:59:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hou Tao <houtao1@...wei.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 021/121] mtd: cfi_cmdset_0002: dont free cfi->cfiq in error path of cfi_amdstd_setup()

From: Hou Tao <houtao1@...wei.com>

[ Upstream commit 03976af89e3bd9489d542582a325892e6a8cacc0 ]

Else there may be a double-free problem, because cfi->cfiq will
be freed by mtd_do_chip_probe() if both the two invocations of
check_cmd_set() return failure.

Signed-off-by: Hou Tao <houtao1@...wei.com>
Reviewed-by: Richard Weinberger <richard@....at>
Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mtd/chips/cfi_cmdset_0002.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index 00ba09fa6f16d..3c4819a05bf03 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -722,7 +722,6 @@ static struct mtd_info *cfi_amdstd_setup(struct mtd_info *mtd)
 	kfree(mtd->eraseregions);
 	kfree(mtd);
 	kfree(cfi->cmdset_priv);
-	kfree(cfi->cfiq);
 	return NULL;
 }
 
-- 
2.25.1