| Message ID | 1598358910-3052-1-git-send-email-varun@chelsio.com |
|---|---|
| State | New |
| Headers | show |
| Series | scsi: target: iscsi: Fix data digest calculation | expand |
On 8/25/20 7:35 AM, Varun Prakash wrote: > 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. > > Fixes: e48354ce078c ("iscsi-target: Add iSCSI fabric support for target v4.1") > Cc: <stable@vger.kernel.org> > Signed-off-by: Varun Prakash <varun@chelsio.com> > --- > drivers/target/iscsi/iscsi_target.c | 17 +++++++++++++++-- > 1 file changed, 15 insertions(+), 2 deletions(-) > > diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c > index c968961..2ec778e 100644 > --- 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); > } > Looks ok to me. Reviewed-by: Mike Christie <michael.christie@oralce.com>
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index c968961..2ec778e 100644 --- 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); }
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. Fixes: e48354ce078c ("iscsi-target: Add iSCSI fabric support for target v4.1") Cc: <stable@vger.kernel.org> Signed-off-by: Varun Prakash <varun@chelsio.com> --- drivers/target/iscsi/iscsi_target.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)