Target/sbc: Initialize COMPARE_AND_WRITE write_sg scatterlist

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

Signed-off-by: Martin Svec <martin.svec@zoner.cz>
Cc: <stable@vger.kernel.org> #3.12+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 62daef5..ec204f7 100644 (file)
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -425,13 +425,14 @@ 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.
         */