[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>
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)