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dnsmasq-discuss

[Dnsmasq-discuss] Announce: dnsmasq-2.92rc2 Re: [Dnsmasq-discuss] [PATCH] Fix arguments order for chaos subdomain check Re: [Dnsmasq-discuss] patch: block-file/allow-file - for review/feedback Re: [Dnsmasq-discuss] patch: block-file/allow-file - for review/feedback Re: [Dnsmasq-discuss] patch: block-file/allow-file - for review/feedback Re: [Dnsmasq-discuss] patch: block-file/allow-file - for review/feedback [Dnsmasq-discuss] patch: block-file/allow-file - for review/feedback Re: [Dnsmasq-discuss] server= with interface parameter changes behavior over time [Dnsmasq-discuss] NFTsets and hosts-files [Dnsmasq-discuss] [PATCH] Allow expired RRSIGs when stale caching is enabled [Dnsmasq-discuss] [PATCH] Fix local host records being overridden by upstream NXDOMAIN [Dnsmasq-discuss] [PATCH] Fix arguments order for chaos subdomain check Re: [Dnsmasq-discuss] Malformed RRSIG Can Crash dnsmasq [Dnsmasq-discuss] Malformed NSEC/NSEC3 Can Hang dnsmasq [Dnsmasq-discuss] Malformed RRSIG Can Crash dnsmasq [Dnsmasq-discuss] Security - IMPORTANT Re: [Dnsmasq-discuss] Issue with circuit-id matching on dhcp requests Re: [Dnsmasq-discuss] Issue with circuit-id matching on dhcp requests Re: [Dnsmasq-discuss] Issue with circuit-id matching on dhcp requests [Dnsmasq-discuss] Issue with circuit-id matching on dhcp requests Re: [Dnsmasq-discuss] [PATCH] bpf.c: fix memory leak in arp_enumerate() on BSD Re: [Dnsmasq-discuss] [PATCH] bpf.c: fix memory leak in arp_enumerate() on BSD Re: [Dnsmasq-discuss] dnssec problem here and now Re: [Dnsmasq-discuss] dnssec problem here and now [Dnsmasq-discuss] dnssec problem here and now Re: [Dnsmasq-discuss] server= with interface parameter changes behavior over time Re: [Dnsmasq-discuss] [PATCH] bpf.c: fix memory leak in arp_enumerate() on BSD Re: [Dnsmasq-discuss] [PATCH] bpf.c: fix memory leak in arp_enumerate() on BSD Re: [Dnsmasq-discuss] [PATCH] Preserve existing log file permissions when adding group-write bit. [Dnsmasq-discuss] server= with interface parameter changes behavior over time [Dnsmasq-discuss] [PATCH] bpf.c: fix memory leak in arp_enumerate() on BSD Re: [Dnsmasq-discuss] [PATCH] Preserve existing log file permissions when adding group-write bit. Re: [Dnsmasq-discuss] [BUG] SIGSEGV when parsing invalid "--interface-name" or "--dynamic-host" options Re: [Dnsmasq-discuss] Suggestion to increase default for max-tcp-connections [Dnsmasq-discuss] server priority clarification after e86d53c [Dnsmasq-discuss] [BUG] SIGSEGV when parsing invalid "--interface-name" or "--dynamic-host" options [Dnsmasq-discuss] Suggestion to increase default for max-tcp-connections Re: [Dnsmasq-discuss] [PATCH] Preserve existing log file permissions when adding group-write bit. [Dnsmasq-discuss] [Bug] Heap buffer overflow in cache_recv_insert() due to pipe de-synchronization Re: [Dnsmasq-discuss] Regression/Feature Request for 2.92 Re: [Dnsmasq-discuss] [PATCH] DHCPv6 network range is not checked well with dhcp-sequential-ip [Dnsmasq-discuss] [Bug] Buffer underflow in hostname_issubdomain() [Dnsmasq-discuss] [PATCH] Don't penalize conditional forwarders for REFUSED responses [Dnsmasq-discuss] BUG:Heap buffer overflow in src/forward.c due to incorrect pointer arithmetic (CWE-122) Re: [Dnsmasq-discuss] Regression/Feature Request for 2.92 Re: [Dnsmasq-discuss] Regression/Feature Request for 2.92 Re: [Dnsmasq-discuss] Regression/Feature Request for 2.92 Re: [Dnsmasq-discuss] Potential privacy issue: filter-rr inefficiency Re: [Dnsmasq-discuss] TCP optimization regressions Re: [Dnsmasq-discuss] Bug: Null pointer dereference in domain-match.c at line 82 (dnsmasq 2.92test21-1-gee09f06) [Dnsmasq-discuss] [PATCH] ubus: add lease management methods [Dnsmasq-discuss] Regression/Feature Request for 2.92 [Dnsmasq-discuss] cotillon por mayor [Dnsmasq-discuss] Por Qué el Alquiler de Plataformas Elevadoras es la Clave del Éxito para Tu Empresa Re: [Dnsmasq-discuss] [PATCH] dnsmasq: failed to create inotify for /etc/resolv.conf: No space left on device [Dnsmasq-discuss] Bug: Null pointer dereference in domain-match.c at line 82 (dnsmasq 2.92test21-1-gee09f06) [Dnsmasq-discuss] TCP optimization regressions Re: [Dnsmasq-discuss] [PATCH] dnsmasq: failed to create inotify for /etc/resolv.conf: No space left on device Re: [Dnsmasq-discuss] dnsmasq 2.92 build-error against Nettle 4.0 Re: [Dnsmasq-discuss] dnsmasq 2.92 build-error against Nettle 4.0 Re: [Dnsmasq-discuss] dnsmasq 2.92 build-error against Nettle 4.0 [Dnsmasq-discuss] dnsmasq 2.92 build-error against Nettle 4.0 [Dnsmasq-discuss] Potential privacy issue: filter-rr inefficiency Re: [Dnsmasq-discuss] Bug with NS records when using dnsmasq as authoritative nameserver without specific auth-interface Re: [Dnsmasq-discuss] Bug with NS records when using dnsmasq as authoritative nameserver without specific auth-interface [Dnsmasq-discuss] Bug with NS records when using dnsmasq as authoritative nameserver without specific auth-interface Re: [Dnsmasq-discuss] segfault with an empty OPTION_SNAME [Dnsmasq-discuss] segfault with an empty OPTION_SNAME Re: [Dnsmasq-discuss] Shut down caused by device request address. Re: [Dnsmasq-discuss] Shut down caused by device request address. Re: [Dnsmasq-discuss] Shut down caused by device request address. [Dnsmasq-discuss] Shut down caused by device request address. [Dnsmasq-discuss] [PATCH] dnsmasq: failed to create inotify for /etc/resolv.conf: No space left on device Re: [Dnsmasq-discuss] dnsmasq with high availability and dynamic range [Dnsmasq-discuss] dnsmasq with high availability and dynamic range [Dnsmasq-discuss] PATCH] PXE boot server (PXEBS) responses broken in 2.92 — missing else in dhcp.c [Dnsmasq-discuss] PATCH] PXE boot server (PXEBS) responses broken in 2.92 — missing else in dhcp.c [Dnsmasq-discuss] Potential memory leak Re: [Dnsmasq-discuss] Incorrect SERVFAIL on dnssec and rivcoed.org. domain [Dnsmasq-discuss] Announce: dnsmasq-2.92 Re: [Dnsmasq-discuss] dnsmasq does not forward requests with no default route is set [Dnsmasq-discuss] DNSSEC validation fails for wildcard subdomains [Dnsmasq-discuss] Add an option to not always add a pseudo header? Re: [Dnsmasq-discuss] Announce: 2.92.rc1, rc3 & patches overseen Re: [Dnsmasq-discuss] Portable PXE boot appliance [Dnsmasq-discuss] Portable PXE boot appliance Re: [Dnsmasq-discuss] Question about IPv6 settings [Dnsmasq-discuss] Incorrect SERVFAIL on dnssec and rivcoed.org. domain [Dnsmasq-discuss] Question about IPv6 settings Re: [Dnsmasq-discuss] iPhone 17 Pro Max DHCP not working [Dnsmasq-discuss] iPhone 17 Pro Max DHCP not working Re: [Dnsmasq-discuss] [PATCH 0/3] Announce: 2.92.rc1 [Dnsmasq-discuss] [PATCH 0/3] Announce: 2.92.rc1 [Dnsmasq-discuss] [PATCH 3/3] Fix some issues with the swedish manual page, some causing lintian warnings [Dnsmasq-discuss] [PATCH2/3] Fix typos in the english manual page [Dnsmasq-discuss] [PATCH 1/3] Remove trailing white space from dnsmasq.conf.example [Dnsmasq-discuss] Announce: 2.92.rc1 [Dnsmasq-discuss] dnsmasq rejects TCP queries originating from Kubernetes pods Re: [Dnsmasq-discuss] Git: Is first dhcp.c address_available() for/if code correct? [Dnsmasq-discuss] [PATCH dnsmasq 1/1] fix SIGSEGV in dbus.c when no dhcp-range is configured
Re: [Dnsmasq-discuss] segfault with an empty OPTION_SNAME
Simon Kelley · 2026-02-27 · via dnsmasq-discuss
Thanks for the report.

https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=66d9658f5f557e0e525e5db5449ef94686df50d3

should fix this.



Cheers,

Simon.

On 24.02.2026 13:30, Jeff Allen via Dnsmasq-discuss wrote:
Hello,

Today I debugged an unexpected new segfault in dnsmasq that appeared on a pre-production system. I found the culprit: a malformed "dhcp-option" line. It was malformed because of a difference between the systems that generate configs in preprod and prod.

But that's my bug, and I'll fix it myself. However, I thought you'd like to know about the possibility of getting segfaults in dnsmasq anyway.

It comes, in dnsmasq 2.90, from rfc2131.c line 2493:

2490      if ((!req_options || !in_list(req_options, OPTION_SNAME)) &&
2491  (opt = option_find2(OPTION_SNAME)) && !(opt->flags & DHOPT_FORCE))
2492 {
2493  safe_strncpy((char *)mess->sname, (char *)opt->val, sizeof(mess- >sname));
2494  done_server = 1;
2495 }

If opt->val is NULL, then safe_strcpy will cause a segfault.

Opt-val was NULL in my case because of this line in my config file:

     dhcp-option=tag:!ARISTA,66,

The tag ARISTA was not set, so this option was used. If there's something after the comma, the crash goes away.

Have a nice day,
   -jeff


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