linux-kernel - [PATCH 3.12 076/182] Target/sbc: Initialize COMPARE_AND_WRITE write

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Message-Id: <19ab8fec186d4f6219122e3d90ab59fa45292f1b.1399973152.git.jslaby@suse.cz>
Date:	Tue, 13 May 2014 11:27:08 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Martin Svec <martin.svec@...er.cz>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 076/182] Target/sbc: Initialize COMPARE_AND_WRITE write_sg scatterlist

From: Martin Svec <martin.svec@...er.cz>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit a1e1774c6dfa3a524dd8df51ca95185fe5ef3247 upstream.

When compiled with CONFIG_DEBUG_SG set, uninitialized SGL leads
to BUG() in compare_and_write_callback().

Signed-off-by: Martin Svec <martin.svec@...er.cz>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/target/target_core_sbc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index d9b92b2c524d..e84149895af2 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -409,13 +409,14 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd)
 		goto out;
 	}
 
-	write_sg = kzalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
+	write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
 			   GFP_KERNEL);
 	if (!write_sg) {
 		pr_err("Unable to allocate compare_and_write sg\n");
 		ret = TCM_OUT_OF_RESOURCES;
 		goto out;
 	}
+	sg_init_table(write_sg, cmd->t_data_nents);
 	/*
 	 * Setup verify and write data payloads from total NumberLBAs.
 	 */
-- 
1.9.3

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