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ksym_tracer: Fix breakpoint removal after modification

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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>
This commit is contained in:
Frederic Weisbecker 2009-11-26 05:35:40 +01:00 committed by Ingo Molnar
parent 470dda7417
commit d99be40aff
1 changed files with 8 additions and 2 deletions
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10
kernel/trace/trace_ksym.c
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@ -339,14 +339,20 @@ static ssize_t ksym_trace_filter_write(struct file *file,
ksym_hbp_handler, true); ksym_hbp_handler, true);
if (IS_ERR(entry->ksym_hbp)) if (IS_ERR(entry->ksym_hbp))
entry->ksym_hbp = NULL; entry->ksym_hbp = NULL;
if (!entry->ksym_hbp)
/* modified without problem */
if (entry->ksym_hbp) {
ret = 0;
goto out; goto out;
}
} else {
ret = 0;
} }
/* Error or "symbol:---" case: drop it */
ksym_filter_entry_count--; ksym_filter_entry_count--;
hlist_del_rcu(&(entry->ksym_hlist)); hlist_del_rcu(&(entry->ksym_hlist));
synchronize_rcu(); synchronize_rcu();
kfree(entry); kfree(entry);
ret = 0;
goto out; goto out;
} else { } else {
/* Check for malformed request: (4) */ /* Check for malformed request: (4) */