On Wed, 04 Dec 2024 15:39:23 +0000, Colin Ian King wrote:
> Shifting reg.bgid << IORING_OFF_PBUF_SHIFT results in a promotion
> from __u16 to a 32 bit signed integer, this is then sign extended
> to a 64 bit unsigned long on 64 bit architectures. If reg.bgid is
> greater than 0x7fff then this leads to a sign extended result where
> all the upper 32 bits of mmap_offset are set to 1. Fix this by
> casting reg.bgid to the same type as mmap_offset before performing
> the shift.
>
> [...]
Applied, thanks!
[1/1] io_uring/kbuf: fix unintentional sign extension on shift of reg.bgid
commit: e54fb80b57e4534ae91e65ea14cc66b9f21b4b7a
Best regards,
--
Jens Axboe
