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From: "agentzh at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/26697] New: NULL pointer dereference might happen in
 get_utrace_lock()
Date: Thu, 01 Oct 2020 22:24:41 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26697

            Bug ID: 26697
           Summary: NULL pointer dereference might happen in
                    get_utrace_lock()
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: agentzh at gmail dot com
  Target Milestone: ---

We often observed kernel panics like the following when fuzzing systemtap w=
ith
load:

```
BUG: unable to handle kernel NULL pointer dereference at           (null)
 #9 [ffff8843e56ffd20] get_utrace_lock at ffffffffc08258c6 [stap_X_40544]
```

Investigating the kdump reveals that the NULL pointer is returned by the
task_utrace_struct() function.

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