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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-07-21 13:35:08 -0700
committerDavid S. Miller <davem@davemloft.net>2008-07-21 13:35:08 -0700
commit47112e25da41d9059626033986dc3353e101f815 (patch)
tree72857968c318960ba50a4cc7232041228e8361dc /net
parent6579e57b31d79d31d9b806e41ba48774e73257dc (diff)
downloadlinux-47112e25da41d9059626033986dc3353e101f815.tar.bz2
udplite: Protection against coverage value wrap-around
This patch clamps the cscov setsockopt values to a maximum of 0xFFFF. Setsockopt values greater than 0xffff can cause an unwanted wrap-around. Further, IPv6 jumbograms are not supported (RFC 3838, 3.5), so that values greater than 0xffff are not even useful. Further changes: fixed a typo in the documentation. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/udp.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index a751770947a3..383d17359d01 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1325,6 +1325,8 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
return -ENOPROTOOPT;
if (val != 0 && val < 8) /* Illegal coverage: use default (8) */
val = 8;
+ else if (val > USHORT_MAX)
+ val = USHORT_MAX;
up->pcslen = val;
up->pcflag |= UDPLITE_SEND_CC;
break;
@@ -1337,6 +1339,8 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
return -ENOPROTOOPT;
if (val != 0 && val < 8) /* Avoid silly minimal values. */
val = 8;
+ else if (val > USHORT_MAX)
+ val = USHORT_MAX;
up->pcrlen = val;
up->pcflag |= UDPLITE_RECV_CC;
break;