[PATCH] scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE

From: TanZheng <[email protected]>

In the iblock_execute_pr_out function, PRO_PREEMPT, PRO_PREEMPT_AND_ABORT
and PRO_RELEASE all perform callback capability checks through
ops->pr_clear. The error check allows unimplemented hooks to pass through
the gate, resulting  dereferencing a NULL function pointer.

Check whether the hooks that need to be called are supported.

Fixes: 394f81184882 ("scsi: target: Add block PR support to iblock")
Signed-off-by: TanZheng <[email protected]>
---
 drivers/target/target_core_iblock.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 1087d1d17c36..ea65d39fef88 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -906,7 +906,7 @@ static sense_reason_t iblock_execute_pr_out(struct se_cmd *cmd, u8 sa, u64 key,
 		break;
 	case PRO_PREEMPT:
 	case PRO_PREEMPT_AND_ABORT:
-		if (!ops->pr_clear) {
+		if (!ops->pr_preempt) {
 			pr_err("block_device does not support pr_preempt.\n");
 			return TCM_UNSUPPORTED_SCSI_OPCODE;
 		}
@@ -916,8 +916,8 @@ static sense_reason_t iblock_execute_pr_out(struct se_cmd *cmd, u8 sa, u64 key,
 				      sa == PRO_PREEMPT_AND_ABORT);
 		break;
 	case PRO_RELEASE:
-		if (!ops->pr_clear) {
-			pr_err("block_device does not support pr_pclear.\n");
+		if (!ops->pr_release) {
+			pr_err("block_device does not support pr_release.\n");
 			return TCM_UNSUPPORTED_SCSI_OPCODE;
 		}
 
-- 
2.25.1