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SubjectRe: KASAN: use-after-free Read in chaoskey_disconnect
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Quoting syzbot (2019-10-30 05:52:08)
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: ff6409a6 usb-fuzzer: main usb gadget fuzzer driver
> git tree: https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=15e1ba24e00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=3230c37d442895b7
> dashboard link: https://syzkaller.appspot.com/bug?extid=6d8505fcdf25f00ac276
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=169b8904e00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166f3104e00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+6d8505fcdf25f00ac276@syzkaller.appspotmail.com
>

Ok, let's try that again

#syz test: https://github.com/google/kasan.git ff6409a6

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 5b799aa973a3..c487709499fc 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -2440,8 +2440,8 @@ void add_hwgenerator_randomness(const char *buffer, size_t count,
* We'll be woken up again once below random_write_wakeup_thresh,
* or when the calling thread is about to terminate.
*/
- wait_event_freezable(random_write_wait,
- kthread_should_stop() ||
+ wait_event_interruptible(random_write_wait,
+ kthread_should_stop() || freezing(current) ||
ENTROPY_BITS(&input_pool) <= random_write_wakeup_bits);
mix_pool_bytes(poolp, buffer, count);
credit_entropy_bits(poolp, entropy);
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