diff options
| author | Yi Zou <yi.zou@intel.com> | 2009-10-21 23:27:58 (GMT) |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2009-12-04 18:00:33 (GMT) |
| commit | d37322a43ebac79eef417149f5696390cf8872db (patch) | |
| tree | 71538cfff1bc2bd82e744ece265e7e6c45c07c6f | |
| parent | 7221d7e59d1c675828b6de50b757cd8282011a5d (diff) | |
| download | linux-d37322a43ebac79eef417149f5696390cf8872db.tar.xz | |
[SCSI] libfc: Fix frags in frame exceeding SKB_MAX_FRAGS in fc_fcp_send_data
In case of sequence offload, in fc_fcp_send_data(), the skb_fill_page_info()
called may end up adding more frags to the skb_shinfo(fp_skb(fp))->frags[],
exceeding SKB_MAX_FRAGS, this eventually corrupts the memory. I am adding the
FR_FRAME_SG_LEN back, but as SKB_MAX_FRAGS -1, leaving 1 for our fcoe_eof_crc
page. And send will be broken into multiple large sends if the frame already
contains more frags than skb handle.
Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
| -rw-r--r-- | drivers/scsi/libfc/fc_fcp.c | 3 | ||||
| -rw-r--r-- | include/scsi/fc_frame.h | 3 |
2 files changed, 5 insertions, 1 deletions
diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c index 40ed744..28bfe1c 100644 --- a/drivers/scsi/libfc/fc_fcp.c +++ b/drivers/scsi/libfc/fc_fcp.c @@ -574,7 +574,8 @@ static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, tlen -= sg_bytes; remaining -= sg_bytes; - if (tlen) + if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && + (tlen)) continue; /* diff --git a/include/scsi/fc_frame.h b/include/scsi/fc_frame.h index c35d238..148126d 100644 --- a/include/scsi/fc_frame.h +++ b/include/scsi/fc_frame.h @@ -37,6 +37,9 @@ #define FC_FRAME_HEADROOM 32 /* headroom for VLAN + FCoE headers */ #define FC_FRAME_TAILROOM 8 /* trailer space for FCoE */ +/* Max number of skb frags allowed, reserving one for fcoe_crc_eof page */ +#define FC_FRAME_SG_LEN (MAX_SKB_FRAGS - 1) + #define fp_skb(fp) (&((fp)->skb)) #define fr_hdr(fp) ((fp)->skb.data) #define fr_len(fp) ((fp)->skb.len) |