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scsi: qla2xxx: Sanitize payload size to prevent member overflow

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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: 875386b988 ("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>
This commit is contained in:
Jiasheng Jiang 2026-01-06 20:53:44 +00:00 • committed by Martin K. Petersen
parent 84dc603739
commit 19bc5f2a69
1 changed files with 7 additions and 0 deletions
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7
drivers/scsi/qla2xxx/qla_isr.c
View file

@ -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)) ?