Subject: [Bug 206525] BUG: KASAN: stack-out-of-bounds in test_bit+0x30/0x44 (kernel 5.6-rc1)

From: [email-masked]
Date: Thu, 20 Feb 2020 12:19:51 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=206525

--- Comment #6 from Nikolay Aleksandrov ([email-masked]) ---
Note that the bug wasn't introduced by my commit, but instead has been there
since:
 commit 4f520900522f
 Author: Richard Guy Briggs <[email-masked]>
 Date:   Tue Apr 22 21:31:54 2014 -0400

    netlink: have netlink per-protocol bind function return an error code.

which moved the ngroups test_bit() to a local variable. My commit only exposed
the bug since it added the 33rd group. I'm currently preparing a fix and will
post it to netdev after verifying and testing it.

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