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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-11-26 05:35:40 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-11-26 09:29:20 +0100 |
| commit | d99be40aff88722ab03ee295e4f6c13a4cca9a3d (patch) | |
| tree | 53b362f02793d2cf1ca78f1d60ad26c1c5a1450e /kernel | |
| parent | 470dda7417f284b9cfc96560b2acd98df63798a2 (diff) | |
| download | linux-d99be40aff88722ab03ee295e4f6c13a4cca9a3d.tar.gz linux-d99be40aff88722ab03ee295e4f6c13a4cca9a3d.tar.bz2 linux-d99be40aff88722ab03ee295e4f6c13a4cca9a3d.zip | |
ksym_tracer: Fix breakpoint removal after modification
The error path of a breakpoint modification is broken in
the ksym tracer. A modified breakpoint hlist node is immediately
released after its removal. Also we leak a breakpoint in this
case.
Fix the path.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1259210142-5714-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_ksym.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c index 11935b53a6cb..9f040e42f516 100644 --- a/kernel/trace/trace_ksym.c +++ b/kernel/trace/trace_ksym.c @@ -339,14 +339,20 @@ static ssize_t ksym_trace_filter_write(struct file *file, ksym_hbp_handler, true); if (IS_ERR(entry->ksym_hbp)) entry->ksym_hbp = NULL; - if (!entry->ksym_hbp) + + /* modified without problem */ + if (entry->ksym_hbp) { + ret = 0; goto out; + } + } else { + ret = 0; } + /* Error or "symbol:---" case: drop it */ ksym_filter_entry_count--; hlist_del_rcu(&(entry->ksym_hlist)); synchronize_rcu(); kfree(entry); - ret = 0; goto out; } else { /* Check for malformed request: (4) */ |