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--- valgrind-3.5.0/coregrind/m_syswrap/syswrap-linux.c.jj	2010-04-07 08:14:12.000000000 -0400
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+++ valgrind-3.5.0/coregrind/m_syswrap/syswrap-linux.c	2010-04-12 07:24:12.838876000 -0400
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@@ -1955,8 +1955,9 @@ PRE(sys_capget)
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                  vki_cap_user_header_t, header, vki_cap_user_data_t, data);
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    PRE_MEM_READ( "capget(header)", ARG1, 
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                   sizeof(struct __vki_user_cap_header_struct) );
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-   PRE_MEM_WRITE( "capget(data)", ARG2, 
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-                  sizeof(struct __vki_user_cap_data_struct) );
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+   if (ARG2 != (Addr)NULL)
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+      PRE_MEM_WRITE( "capget(data)", ARG2, 
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+                      sizeof(struct __vki_user_cap_data_struct) );
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 }
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 POST(sys_capget)
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 {