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authorDavid S. Miller <davem@sunset.davemloft.net>2007-10-31 00:29:29 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-31 00:29:29 -0400
commit51c739d1f484b2562040a3e496dc8e1670d4e279 (patch)
tree87b12c2330f2951deb1a435367907d15a5d938c3 /net/ipv4/tcp_ipv4.c
parent07afa040252eb41f91f46f8e538b434a63122999 (diff)
[NET]: Fix incorrect sg_mark_end() calls.
This fixes scatterlist corruptions added by commit 68e3f5dd4db62619fdbe520d36c9ebf62e672256 [CRYPTO] users: Fix up scatterlist conversion errors The issue is that the code calls sg_mark_end() which clobbers the sg_page() pointer of the final scatterlist entry. The first part fo the fix makes skb_to_sgvec() do __sg_mark_end(). After considering all skb_to_sgvec() call sites the most correct solution is to call __sg_mark_end() in skb_to_sgvec() since that is what all of the callers would end up doing anyways. I suspect this might have fixed some problems in virtio_net which is the sole non-crypto user of skb_to_sgvec(). Other similar sg_mark_end() cases were converted over to __sg_mark_end() as well. Arguably sg_mark_end() is a poorly named function because it doesn't just "mark", it clears out the page pointer as a side effect, which is what led to these bugs in the first place. The one remaining plain sg_mark_end() call is in scsi_alloc_sgtable() and arguably it could be converted to __sg_mark_end() if only so that we can delete this confusing interface from linux/scatterlist.h Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
-rw-r--r--net/ipv4/tcp_ipv4.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index d3d8d5dfcee3..eec02b29ffcf 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1083,7 +1083,7 @@ static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
1083 sg_set_buf(&sg[block++], key->key, key->keylen); 1083 sg_set_buf(&sg[block++], key->key, key->keylen);
1084 nbytes += key->keylen; 1084 nbytes += key->keylen;
1085 1085
1086 sg_mark_end(sg, block); 1086 __sg_mark_end(&sg[block - 1]);
1087 1087
1088 /* Now store the Hash into the packet */ 1088 /* Now store the Hash into the packet */
1089 err = crypto_hash_init(desc); 1089 err = crypto_hash_init(desc);