Messages in this thread Patch in this message | | | From | Shakil A Khan <> | Subject | [PATCH] Freeing dst when the reference count <0 causes general protection fault, it could be a major security flaw as rogue app can modify dst to crash kernel. | Date | Sat, 13 Sep 2014 01:27:13 -0700 |
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Signed-off-by: Shakil A Khan <shakilk1729@gmail.com> --- net/core/dst.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/core/dst.c b/net/core/dst.c index a028409..6a848b0 100644 --- a/net/core/dst.c +++ b/net/core/dst.c @@ -284,7 +284,10 @@ void dst_release(struct dst_entry *dst) int newrefcnt; newrefcnt = atomic_dec_return(&dst->__refcnt); - WARN_ON(newrefcnt < 0); + + if (WARN(newrefcnt < 0, "dst reference count less than zero")) + return; + if (unlikely(dst->flags & DST_NOCACHE) && !newrefcnt) call_rcu(&dst->rcu_head, dst_destroy_rcu); } -- 1.9.3
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