git: DragonFly_RELEASE_6_4 net: Fix ifnet_mtx deadlock in ifioctl()

[Aaron LI]

commit f5f3e1f5506db617274a4b521172ecc4d8e0b047
Author: Nathan Sapwell <nathan at dreamfast.solutions>
Date:   Thu Jul 2 12:19:45 2026 +0000

    net: Fix ifnet_mtx deadlock in ifioctl()
    
    Several error paths in ifioctl()'s switch (SIOCGIFGROUP, SIOCAIFGROUP,
    SIOCDIFGROUP, SIOCSIFDESCR) return directly instead of break, bypassing
    the ifnet_unlock() at the end of the function.  As a result, ifnet_mtx
    is held across the switch and will block any future ifnet_lock() calls,
    which basically breaks the network subsystem.
    
    What makes matter worse is that SIOCGIFGROUP has no caps check, so
    any local user can trigger such a deadlock in the network subsystem.
    
    GitHub-PR: #47
    Assisted-with: Zhipu GLM-5.2

Summary of changes:
 sys/net/if.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/f5f3e1f5506db617274a4b521172ecc4d8e0b047


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