[RFC PATCH 1/3] tcm_iscsi: warn on incorrect precondition for iscsit_do_crypto_hash_sg

[Paolo Bonzini]

While iscsit_do_crypto_hash_sg does look at cmd->first_data_sg_off
when computing cur_len, it ignores it completely when computing the
hash.  As a result, the first cmd->first_data_sg_off bytes are
included in the hash even though they should not.  Warn if this
happens.

Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
 drivers/target/iscsi/iscsi_target.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 97c0f78..224679e 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1135,6 +1135,7 @@ static u32 iscsit_do_crypto_hash_sg(
 
 	sg = cmd->first_data_sg;
 	page_off = cmd->first_data_sg_off;
+	WARN_ON(page_off != sg->offset);
 
 	i = 0;
 	while (data_length) {
-- 
1.7.1


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