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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-07-24 00:11:56 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2008-07-28 10:58:18 -0700
commit5564d385e9b0cddc7c831af9f90a2f53aa472953 (patch)
tree6773970d5abeb7bd8ec2df1a766ce3171b926f67 /net
parentb5fe255cb6adab0cfe9826ce792d0f866323b269 (diff)
udplite: Protection against coverage value wrap-around
[ Upstream commit 47112e25da41d9059626033986dc3353e101f815 ] 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. [ Add USHORT_MAX from upstream to linux/kernel.h -DaveM ] Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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 1704c1474ea1..9703c870f1df 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;