* [Bug runtime/26697] New: NULL pointer dereference might happen in get_utrace_lock()
@ 2020-10-01 22:24 agentzh at gmail dot com
2020-10-01 22:29 ` [Bug runtime/26697] " agentzh at gmail dot com
0 siblings, 1 reply; 2+ messages in thread
From: agentzh at gmail dot com @ 2020-10-01 22:24 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=26697
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 with
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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* [Bug runtime/26697] NULL pointer dereference might happen in get_utrace_lock()
2020-10-01 22:24 [Bug runtime/26697] New: NULL pointer dereference might happen in get_utrace_lock() agentzh at gmail dot com
@ 2020-10-01 22:29 ` agentzh at gmail dot com
0 siblings, 0 replies; 2+ messages in thread
From: agentzh at gmail dot com @ 2020-10-01 22:29 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=26697
agentzh <agentzh at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #1 from agentzh <agentzh at gmail dot com> ---
Fixed in commit 619f6940d. Thanks Sultan Alsawaf for the patch.
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