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Andrea Righi fixed a NULL pointer dereference in trace_kprobe_create()

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It is possible to trigger a NULL pointer dereference by writing an
 incorrectly formatted string to the krpobe_events file.
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Merge tag 'trace-v5.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fix from Steven Rostedt:
 "Andrea Righi fixed a NULL pointer dereference in trace_kprobe_create()

  It is possible to trigger a NULL pointer dereference by writing an
  incorrectly formatted string to the krpobe_events file"

* tag 'trace-v5.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing/kprobes: Fix NULL pointer dereference in trace_kprobe_create()
This commit is contained in:
Linus Torvalds 2019-01-16 05:28:26 +12:00
commit 7939f8beec
1 changed files with 9 additions and 3 deletions
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12
kernel/trace/trace_kprobe.c
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@ -607,11 +607,17 @@ static int trace_kprobe_create(int argc, const char *argv[])
char buf[MAX_EVENT_NAME_LEN];
unsigned int flags = TPARG_FL_KERNEL;
/* argc must be >= 1 */
if (argv[0][0] == 'r') {
switch (argv[0][0]) {
case 'r':
is_return = true;
flags |= TPARG_FL_RETURN;
} else if (argv[0][0] != 'p' || argc < 2)
break;
case 'p':
break;
default:
return -ECANCELED;
}
if (argc < 2)
return -ECANCELED;
event = strchr(&argv[0][1], ':');