linux-kernel - [PATCH 4.9 123/134] dm era: Use correct value size in equality function of writeset tree

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Message-Id: <20210301161019.636131504@linuxfoundation.org>
Date:   Mon,  1 Mar 2021 17:13:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nikos Tsironis <ntsironis@...ikto.com>,
        Ming-Hung Tsai <mtsai@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 4.9 123/134] dm era: Use correct value size in equality function of writeset tree

From: Nikos Tsironis <ntsironis@...ikto.com>

commit 64f2d15afe7b336aafebdcd14cc835ecf856df4b upstream.

Fix the writeset tree equality test function to use the right value size
when comparing two btree values.

Fixes: eec40579d84873 ("dm: add era target")
Cc: stable@...r.kernel.org # v3.15+
Signed-off-by: Nikos Tsironis <ntsironis@...ikto.com>
Reviewed-by: Ming-Hung Tsai <mtsai@...hat.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/md/dm-era-target.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/dm-era-target.c
+++ b/drivers/md/dm-era-target.c
@@ -389,7 +389,7 @@ static void ws_dec(void *context, const
 
 static int ws_eq(void *context, const void *value1, const void *value2)
 {
-	return !memcmp(value1, value2, sizeof(struct writeset_metadata));
+	return !memcmp(value1, value2, sizeof(struct writeset_disk));
 }
 
 /*----------------------------------------------------------------*/