From 9b80cb4be1f4181875e0cf274dc59f42964fdf1b Mon Sep 17 00:00:00 2001 From: Mike Christie Date: Sun, 17 Dec 2006 12:10:28 -0600 Subject: [SCSI] libiscsi: fix senselen calculation Yanling Qi, noted that when the sense data length of a check-condition is greater than 0x7f (127), senselen = (data[0] << 8) | data[1] will become negative. It causes different kinds of panics from GPF, spin_lock deadlock to spin_lock recursion. We were also swapping this value on big endien machines. This patch fixes both issues by using be16_to_cpu(). Signed-off-by: Mike Christie Signed-off-by: James Bottomley --- drivers/scsi/libiscsi.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/scsi') diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index e11b23c641e2..d37048c96eab 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -260,7 +260,7 @@ static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, } if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { - int senselen; + uint16_t senselen; if (datalen < 2) { invalid_datalen: @@ -270,12 +270,12 @@ invalid_datalen: goto out; } - senselen = (data[0] << 8) | data[1]; + senselen = be16_to_cpu(*(uint16_t *)data); if (datalen < senselen) goto invalid_datalen; memcpy(sc->sense_buffer, data + 2, - min(senselen, SCSI_SENSE_BUFFERSIZE)); + min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); debug_scsi("copied %d bytes of sense\n", min(senselen, SCSI_SENSE_BUFFERSIZE)); } -- cgit v1.2.3