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>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 62daef5c0c8f..ec204f7ef126 100644
--- 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.
          */