scsi: target: iscsi: Fix data digest calculation

Current code does not consider 'page_off' in data digest calculation. To
fix this, add a local variable 'first_sg' and set first_sg.offset to
sg->offset + page_off.

Link: https://lore.kernel.org/r/1598358910-3052-1-git-send-email-varun@chelsio.com
Fixes: e48354ce078c ("iscsi-target: Add iSCSI fabric support for target v4.1")
Cc: <stable@vger.kernel.org>
Reviewed-by: Mike Christie <michael.christie@oralce.com>
Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index c968961..2ec778e 100644 (file)
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1389,14 +1389,27 @@ static u32 iscsit_do_crypto_hash_sg(
        sg = cmd->first_data_sg;
        page_off = cmd->first_data_sg_off;
 
+       if (data_length && page_off) {
+               struct scatterlist first_sg;
+               u32 len = min_t(u32, data_length, sg->length - page_off);
+
+               sg_init_table(&first_sg, 1);
+               sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
+
+               ahash_request_set_crypt(hash, &first_sg, NULL, len);
+               crypto_ahash_update(hash);
+
+               data_length -= len;
+               sg = sg_next(sg);
+       }
+
        while (data_length) {
-               u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
+               u32 cur_len = min_t(u32, data_length, sg->length);
 
                ahash_request_set_crypt(hash, sg, NULL, cur_len);
                crypto_ahash_update(hash);
 
                data_length -= cur_len;
-               page_off = 0;
                /* iscsit_map_iovec has already checked for invalid sg pointers */
                sg = sg_next(sg);
        }