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| author | Tom Zanussi <tzanussi@gmail.com> | 2009-03-23 03:26:42 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-23 09:30:36 +0100 |
| commit | ee6cdabc820a29bd607f38d9cb335c3ceddc673b (patch) | |
| tree | bc4cbebd9abc679bb12b10d19f8ab9a7a23689dd /kernel | |
| parent | 75c8b417526529d0a7072e4d93ec99dbd483a6f4 (diff) | |
| download | linux-ee6cdabc820a29bd607f38d9cb335c3ceddc673b.tar.gz linux-ee6cdabc820a29bd607f38d9cb335c3ceddc673b.tar.xz | |
tracing/filters: fix bug in copy_pred()
Impact: fix potential crash on subsystem filter expression freeing
When making a copy of the predicate, pred->field_name needs to be
duplicated in the copy as well, otherwise bad things can happen due to
later multiple frees of the same string.
This affects only per-subsystem event filtering.
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: =?ISO-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1237796802.7527.39.camel@charm-linux>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_events_filter.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index c4a413b70f78..fd01d8022ad1 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -276,11 +276,19 @@ static struct filter_pred *copy_pred(struct filter_pred *pred) return NULL; memcpy(new_pred, pred, sizeof(*pred)); + + if (pred->field_name) { + new_pred->field_name = kstrdup(pred->field_name, GFP_KERNEL); + if (!new_pred->field_name) { + kfree(new_pred); + return NULL; + } + } + if (pred->str_val) { new_pred->str_val = kstrdup(pred->str_val, GFP_KERNEL); - new_pred->field_name = kstrdup(pred->field_name, GFP_KERNEL); if (!new_pred->str_val) { - kfree(new_pred); + filter_free_pred(new_pred); return NULL; } } |