On Wed, Jan 02, 2019 at 09:59:10AM -0800, Mike Marciniszyn wrote:
> From: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx>
>
> Upstream commit dbc2970caef74e8ff41923d302aa6fb5a4812d0e.
>
> An incorrect sge sizing in the HFI PIO path will cause an OOPs similar to
> this:
>
> BUG: unable to handle kernel NULL pointer dereference at (null)
> IP: [] hfi1_verbs_send_pio+0x3d8/0x530 [hfi1]
> PGD 0
> Oops: 0000 1 SMP
> Call Trace:
> ? hfi1_verbs_send_dma+0xad0/0xad0 [hfi1]
> hfi1_verbs_send+0xdf/0x250 [hfi1]
> ? make_rc_ack+0xa80/0xa80 [hfi1]
> hfi1_do_send+0x192/0x430 [hfi1]
> hfi1_do_send_from_rvt+0x10/0x20 [hfi1]
> rvt_post_send+0x369/0x820 [rdmavt]
> ib_uverbs_post_send+0x317/0x570 [ib_uverbs]
> ib_uverbs_write+0x26f/0x420 [ib_uverbs]
> ? security_file_permission+0x21/0xa0
> vfs_write+0xbd/0x1e0
> ? mntput+0x24/0x40
> SyS_write+0x7f/0xe0
> system_call_fastpath+0x16/0x1b
>
> Fix by adding the missing sizing check to correctly determine the sge
> length.
>
> Fixes: 7724105686e7 ("IB/hfi1: add driver files")
> Cc: <stable@xxxxxxxxxxxxxxx> # 4.9.x+
This fails to apply to 4.9.y :(
