From: Steven Rostedt <rostedt@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Andrew Morton <akpm@linux-foundation.org>,
stable@vger.kernel.org, Tom Zanussi <tom.zanussi@linux.intel.com>,
Rosen Penev <rosenp@gmail.com>, Sashiko <sashiko-bot@kernel.org>
Subject: [for-linus][PATCH 2/2] tracing: Do not call map->ops->elt_free() if elt_alloc() fails
Date: Thu, 21 May 2026 16:45:29 -0400 [thread overview]
Message-ID: <20260521204710.725769391@kernel.org> (raw)
In-Reply-To: 20260521204527.100913207@kernel.org
From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
In paths where tracing_map_elt_alloc() failed to allocate objects,
the map->ops->elt_alloc() call was never successful. In this case,
map->ops->elt_free() should not be called.
Link: https://sashiko.dev/#/patchset/20260520223101.34710-1-rosenp%40gmail.com
Cc: stable@vger.kernel.org
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Rosen Penev <rosenp@gmail.com>
Reported-by: Sashiko <sashiko-bot@kernel.org>
Fixes: 2734b629525a ("tracing: Add per-element variable support to tracing_map")
Link: https://patch.msgid.link/177933895460.108746.5396070821443932634.stgit@devnote2
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
kernel/trace/tracing_map.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/kernel/trace/tracing_map.c b/kernel/trace/tracing_map.c
index bf1a507695b6..0dd7927df22a 100644
--- a/kernel/trace/tracing_map.c
+++ b/kernel/trace/tracing_map.c
@@ -386,13 +386,11 @@ static void tracing_map_elt_init_fields(struct tracing_map_elt *elt)
}
}
-static void tracing_map_elt_free(struct tracing_map_elt *elt)
+static void __tracing_map_elt_free(struct tracing_map_elt *elt)
{
if (!elt)
return;
- if (elt->map->ops && elt->map->ops->elt_free)
- elt->map->ops->elt_free(elt);
kfree(elt->fields);
kfree(elt->vars);
kfree(elt->var_set);
@@ -400,6 +398,17 @@ static void tracing_map_elt_free(struct tracing_map_elt *elt)
kfree(elt);
}
+static void tracing_map_elt_free(struct tracing_map_elt *elt)
+{
+ if (!elt)
+ return;
+
+ /* Only objects initialized with alloc_elt() should be passed to free_elt().*/
+ if (elt->map->ops && elt->map->ops->elt_free)
+ elt->map->ops->elt_free(elt);
+ __tracing_map_elt_free(elt);
+}
+
static struct tracing_map_elt *tracing_map_elt_alloc(struct tracing_map *map)
{
struct tracing_map_elt *elt;
@@ -444,7 +453,7 @@ static struct tracing_map_elt *tracing_map_elt_alloc(struct tracing_map *map)
}
return elt;
free:
- tracing_map_elt_free(elt);
+ __tracing_map_elt_free(elt);
return ERR_PTR(err);
}
--
2.53.0
parent reply other threads:[~2026-05-21 20:46 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20260521204527.100913207@kernel.org>]
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