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Date: Wed, 01 Apr 2009 12:12:24 +0800
From: Eugene Teo <>
CC: "Steven M. Christey" <>
Subject: CVE request: kernel: udp: Wrong locking code in udp seq_file infrastructure

According to the upstream commit 30842f298, reading zero bytes from
/proc/net/udp or other similar files which use the same seq_file udp
infrastructure panics kernel in that way:

[ BUG: bad unlock balance detected! ]
read/1985 is trying to release lock (&table->hash[i].lock) at:
[<ffffffff81321d83>] udp_seq_stop+0x27/0x29
but there are no more locks to release!

This bug was introduced and fixed within a short timeframe. It was
introduced in 645ca708 (Follows: v2.6.28-rc2; Precedes: v2.6.29-rc1).

Thanks, Eugene
Eugene Teo / Red Hat Security Response Team

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