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authorDaniel Borkmann <dborkman@redhat.com>2013-02-13 05:03:50 +0400
committerDavid S. Miller <davem@davemloft.net>2013-02-13 23:07:14 +0400
commit222229974824a4f30b417531cdc9b5b869d6a6b7 (patch)
tree969feca003eb973f6b2ac5fc9e4a7eafc058372c /net/sctp/probe.c
parent1e558174637689a53a24b4c94f6f1aed38361b3e (diff)
downloadlinux-222229974824a4f30b417531cdc9b5b869d6a6b7.tar.xz
net: sctp: add build check for sctp_sf_eat_sack_6_2/jsctp_sf_eat_sack
In order to avoid any future surprises of kernel panics due to jprobes function mismatches (as e.g. fixed in 4cb9d6eaf85ecd: sctp: jsctp_sf_eat_sack: fix jprobes function signature mismatch), we should check both function types during build and scream loudly if they do not match. __same_type resolves to __builtin_types_compatible_p, which is 1 in case both types are the same and 0 otherwise, qualifiers are ignored. Tested by myself. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/probe.c')
-rw-r--r--net/sctp/probe.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/sctp/probe.c b/net/sctp/probe.c
index 4eaaaf68e5b7..261b7b9858a4 100644
--- a/net/sctp/probe.c
+++ b/net/sctp/probe.c
@@ -183,6 +183,13 @@ static __init int sctpprobe_init(void)
{
int ret = -ENOMEM;
+ /* Warning: if the function signature of sctp_sf_eat_sack_6_2,
+ * has been changed, you also have to change the signature of
+ * jsctp_sf_eat_sack, otherwise you end up right here!
+ */
+ BUILD_BUG_ON(__same_type(sctp_sf_eat_sack_6_2,
+ jsctp_sf_eat_sack) == 0);
+
init_waitqueue_head(&sctpw.wait);
spin_lock_init(&sctpw.lock);
if (kfifo_alloc(&sctpw.fifo, bufsize, GFP_KERNEL))