scsi: qla2xxx: Sanitize payload size to prevent member overflow

In qla27xx_copy_fpin_pkt() and qla27xx_copy_multiple_pkt(), the frame_size
reported by firmware is used to calculate the copy length into
item->iocb. However, the iocb member is defined as a fixed-size 64-byte
array within struct purex_item.

If the reported frame_size exceeds 64 bytes, subsequent memcpy calls will
overflow the iocb member boundary. While extra memory might be allocated,
this cross-member write is unsafe and triggers warnings under
CONFIG_FORTIFY_SOURCE.

Fix this by capping total_bytes to the size of the iocb member (64 bytes)
before allocation and copying. This ensures all copies remain within the
bounds of the destination structure member.

Fixes: 875386b98857 ("scsi: qla2xxx: Add Unsolicited LS Request and Response Support for NVMe")
Signed-off-by: Jiasheng Jiang <jiashengjiangcool@gmail.com>
Reviewed-by: Himanshu Madhani <hmadhani2024@gmail.com>
Link: https://patch.msgid.link/20260106205344.18031-1-jiashengjiangcool@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index a3971afc2dd1e9d1c6e90c7e426e35a15f608ca2..a04a5aa0d00572fb053e8537599dc35960c3399b 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -878,6 +878,9 @@ qla27xx_copy_multiple_pkt(struct scsi_qla_host *vha, void **pkt,
                payload_size = sizeof(purex->els_frame_payload);
        }
 
+       if (total_bytes > sizeof(item->iocb.iocb))
+               total_bytes = sizeof(item->iocb.iocb);
+
        pending_bytes = total_bytes;
        no_bytes = (pending_bytes > payload_size) ? payload_size :
                   pending_bytes;
@@ -1163,6 +1166,10 @@ qla27xx_copy_fpin_pkt(struct scsi_qla_host *vha, void **pkt,
 
        total_bytes = (le16_to_cpu(purex->frame_size) & 0x0FFF)
            - PURX_ELS_HEADER_SIZE;
+
+       if (total_bytes > sizeof(item->iocb.iocb))
+               total_bytes = sizeof(item->iocb.iocb);
+
        pending_bytes = total_bytes;
        entry_count = entry_count_remaining = purex->entry_count;
        no_bytes = (pending_bytes > sizeof(purex->els_frame_payload))  ?