From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Tom Zanussi <tom.zanussi@linux.intel.com>
Subject: [for-next][PATCH 4/5] tracing: Handle tracing_map_alloc_elts() error path correctly
Date: Wed, 27 Apr 2016 12:32:31 -0400 [thread overview]
Message-ID: <20160427163251.159126076@goodmis.org> (raw)
In-Reply-To: 20160427163227.271103189@goodmis.org
[-- Attachment #1: 0004-tracing-Handle-tracing_map_alloc_elts-error-path-cor.patch --]
[-- Type: text/plain, Size: 1743 bytes --]
From: Tom Zanussi <tom.zanussi@linux.intel.com>
If tracing_map_elt_alloc() fails, it will return ERR_PTR() instead of
NULL, so change the check to IS_ERROR(). We also need to set the
failed entry in the map->elts array to NULL instead of ERR_PTR() so
tracing_map_free_elts() doesn't try freeing an ERR_PTR().
tracing_map_free_elts() should also zero out what it frees so a
reentrant call won't find previously freed elements.
Link: http://lkml.kernel.org/r/f29d03b00bce3aac8cf151a8a30e6c83e5fee66d.1461610073.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
kernel/trace/tracing_map.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/kernel/trace/tracing_map.c b/kernel/trace/tracing_map.c
index e7dfc5eec669..0a689bbb78ef 100644
--- a/kernel/trace/tracing_map.c
+++ b/kernel/trace/tracing_map.c
@@ -366,10 +366,13 @@ static void tracing_map_free_elts(struct tracing_map *map)
if (!map->elts)
return;
- for (i = 0; i < map->max_elts; i++)
+ for (i = 0; i < map->max_elts; i++) {
tracing_map_elt_free(*(TRACING_MAP_ELT(map->elts, i)));
+ *(TRACING_MAP_ELT(map->elts, i)) = NULL;
+ }
tracing_map_array_free(map->elts);
+ map->elts = NULL;
}
static int tracing_map_alloc_elts(struct tracing_map *map)
@@ -383,7 +386,8 @@ static int tracing_map_alloc_elts(struct tracing_map *map)
for (i = 0; i < map->max_elts; i++) {
*(TRACING_MAP_ELT(map->elts, i)) = tracing_map_elt_alloc(map);
- if (!(*(TRACING_MAP_ELT(map->elts, i)))) {
+ if (IS_ERR(*(TRACING_MAP_ELT(map->elts, i)))) {
+ *(TRACING_MAP_ELT(map->elts, i)) = NULL;
tracing_map_free_elts(map);
return -ENOMEM;
--
2.8.0.rc3
next prev parent reply other threads:[~2016-04-27 16:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-27 16:32 [for-next][PATCH 0/5] tracing: More updates for 4.7 Steven Rostedt
2016-04-27 16:32 ` [for-next][PATCH 1/5] tracing: Do not inherit event-fork option for instances Steven Rostedt
2016-04-27 16:32 ` [for-next][PATCH 2/5] tracing: checking for NULL instead of IS_ERR() Steven Rostedt
2016-04-27 16:32 ` [for-next][PATCH 3/5] tracing: Add check for NULL event field when creating hist field Steven Rostedt
2016-04-27 16:32 ` Steven Rostedt [this message]
2016-04-27 16:32 ` [for-next][PATCH 5/5] tracing: Dont use the address of the buffer array name in copy_from_user Steven Rostedt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160427163251.159126076@goodmis.org \
--to=rostedt@goodmis.org \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=tom.zanussi@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.