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authorYi Zou <yi.zou@intel.com>2009-10-21 16:27:58 -0700
committerJames Bottomley <James.Bottomley@suse.de>2009-12-04 12:00:33 -0600
commitd37322a43ebac79eef417149f5696390cf8872db (patch)
tree71538cfff1bc2bd82e744ece265e7e6c45c07c6f /include/scsi
parent7221d7e59d1c675828b6de50b757cd8282011a5d (diff)
downloadlinux-linaro-android-d37322a43ebac79eef417149f5696390cf8872db.tar.gz
[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>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/fc_frame.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/scsi/fc_frame.h b/include/scsi/fc_frame.h
index c35d2383cc2..148126dcf9e 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)