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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Fri, 18 Dec 2009 14:27:18 +0000 (UTC)
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Subject: svn commit: r200667 - head/sys/compat/linux
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Author: kib
Date: Fri Dec 18 14:27:18 2009
New Revision: 200667
URL: http://svn.freebsd.org/changeset/base/200667

Log:
  Signal 0 is used to check the permission for current process to signal
  target one. Since r184058, linux_do_tkill() calls tdsignal() instead of
  kill(), without checking for validity of supplied signal number. Prevent
  panic when supplied signal is 0 by finishing work after checks.
  
  Found and tested by:	scf
  MFC after:	3 days

Modified:
  head/sys/compat/linux/linux_signal.c

Modified: head/sys/compat/linux/linux_signal.c
==============================================================================
--- head/sys/compat/linux/linux_signal.c	Fri Dec 18 12:10:42 2009	(r200666)
+++ head/sys/compat/linux/linux_signal.c	Fri Dec 18 14:27:18 2009	(r200667)
@@ -565,7 +565,7 @@ linux_do_tkill(struct thread *td, l_int 
 
 	AUDIT_ARG_PROCESS(p);
 	error = p_cansignal(td, p, signum);
-	if (error)
+	if (error != 0 || signum == 0)
 		goto out;
 
 	error = ESRCH;