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Re: Issue 52206 in oss-fuzz: gpsd:FuzzLibgps: Use-of-uninitialized-value

From: Gary E. Miller
Subject: Re: Issue 52206 in oss-fuzz: gpsd:FuzzLibgps: Use-of-uninitialized-value in gps_unpack
Date: Fri, 7 Oct 2022 10:29:29 -0700

Yo ClusterFuzz-External!

I still get permission denied when I try to acccess

This bug is invalid.  The fuzzer is calling an internal function,
gps_unpack(), that needs a NUL terminated string input, and then
complaining when the input buffer is overrun.  That is like complaning
about strlen() overrunning a non NUL terminated strgin.

The fuzzer is calling an internal function, gps_unpack(), that is not
accessible from the outside.  In normal operation there is a NUL check
before calling gpsd_unpack().

On Fri, 07 Oct 2022 09:17:26 -0700
ClusterFuzz-External via monorail <>

> Status: New
> Owner: ----
> CC:,, 
> Labels: Restrict-View-Commit ClusterFuzz Reproducible
> Stability-Memory-MemorySanitizer Engine-libfuzzer OS-Linux
> Security_Severity-Medium Proj-gpsd Reported-2022-10-07 Type:
> Bug-Security
> New issue 52206 by ClusterFuzz-External: gpsd:FuzzLibgps:
> Use-of-uninitialized-value in gps_unpack
> Detailed Report:
> Project: gpsd
> Fuzzing Engine: libFuzzer
> Fuzz Target: FuzzLibgps
> Job Type: libfuzzer_msan_gpsd
> Platform Id: linux
> Crash Type: Use-of-uninitialized-value
> Crash Address: 
> Crash State:
>   gps_unpack
>   FuzzLibgps.c
> Sanitizer: memory (MSAN)
> Recommended Security Severity: Medium
> Crash Revision:
> Reproducer Testcase:
> Issue filed automatically.
> See for
> instructions to reproduce this bug locally. When you fix this bug,
> please
>   * mention the fix revision(s).
>   * state whether the bug was a short-lived regression or an old bug
> in any stable releases.
>   * add any other useful information.
> This information can help downstream consumers.
> If you need to contact the OSS-Fuzz team with a question, concern, or
> any other feedback, please file an issue at
> Comments on individual
> Monorail issues are not monitored.
> This bug is subject to a 90 day disclosure deadline. If 90 days elapse
> without an upstream patch, then the bug report will automatically
> become visible to the public.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin

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