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authorMike Christie <michaelc@cs.wisc.edu>2006-12-17 12:10:28 -0600
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2007-01-06 09:02:09 -0600
commit9b80cb4be1f4181875e0cf274dc59f42964fdf1b (patch)
tree37587f07724c7382547f056e54e8a52e6e84a594 /drivers/scsi
parent94cb3f822bb806a750e1e1c8457bee6e96671569 (diff)
[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 <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/libiscsi.c6
1 files changed, 3 insertions, 3 deletions
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));
}