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Date: Sun, 3 Jul 2022 10:23:59 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: LKML <linux-kernel@...r.kernel.org> Cc: David Ahern <dsahern@...il.com>, "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org Subject: [PATCH] tracing/ipv4/ipv6: Give size to name field in fib*_lookup_table event From: "Steven Rostedt (Google)" <rostedt@...dmis.org> The fib_lookup_table and fib6_lookup_table events declare name as a dynamic_array, but also give it a fixed size, which defeats the purpose of the dynamic array, especially since the dynamic array also includes meta data in the event to specify its size. Considering that the intent was to only reserve the size needed for the name and not a fixed size, convert the size part of the __dynamic_array() field to contain the necessary code to determine the size needed to save the name. Alternatively, if the intent was to use a fixed size, then it should be converted into __array() of type char, which will remove the meta data in the event that stores the size. Cc: David Ahern <dsahern@...il.com> Cc: David S. Miller <davem@...emloft.net> Cc: netdev@...r.kernel.org Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org> --- include/trace/events/fib.h | 2 +- include/trace/events/fib6.h | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/include/trace/events/fib.h b/include/trace/events/fib.h index 6f2a4dc35e37..76f925f5519a 100644 --- a/include/trace/events/fib.h +++ b/include/trace/events/fib.h @@ -32,7 +32,7 @@ TRACE_EVENT(fib_table_lookup, __array( __u8, gw6, 16 ) __field( u16, sport ) __field( u16, dport ) - __dynamic_array(char, name, IFNAMSIZ ) + __dynamic_array(char, name, nhc && nhc->nhc_dev ? strlen(nhc->nhc_dev->name) + 1 : sizeof("-") ) ), TP_fast_assign( diff --git a/include/trace/events/fib6.h b/include/trace/events/fib6.h index c6abdcc77c12..d3aee58e58fd 100644 --- a/include/trace/events/fib6.h +++ b/include/trace/events/fib6.h @@ -31,7 +31,8 @@ TRACE_EVENT(fib6_table_lookup, __field( u16, dport ) __field( u8, proto ) __field( u8, rt_type ) - __dynamic_array( char, name, IFNAMSIZ ) + __dynamic_array( char, name, res->nh && res->nh->fib_nh_dev ? + strlen(res->nh->fib_nh_dev->name) + 1 : sizeof("-") ) __array( __u8, gw, 16 ) ), -- 2.35.1
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