On Mon, Feb 21, 2022 at 09:23:04PM +0530, Anirudh Rayabharam wrote:
On Mon, Feb 21, 2022 at 03:12:33PM +0100, Stefano Garzarella wrote:
#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
f71077a4d84b
Patch sent upstream:
https://lore.kernel.org/virtualization/20220221114916.107045-1-sgarzare@xxxxxxxxxx/T/#u
I don't see how your patch fixes this issue. It looks unrelated. It is
surprising that syzbot is happy with it.
I have sent a patch for this issue here:
https://lore.kernel.org/lkml/20220221072852.31820-1-mail@xxxxxxxxxxxxx/
It is related because the worker thread is accessing the iotlb that is
going to be freed, so it could be corrupted/invalid.
Your patch seems right, but simply prevents iotlb from being set for the
the specific test case, so it remains NULL and iotlb_access_ok() exits
immediately.
Anyway, currently if nregions is 0 vhost_set_memory() sets an iotlb with
no regions (the for loop is not executed), so I'm not sure
iotlb_access_ok() cycles infinitely.
Stefano
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