> On Aug 17, 2021, at 10:04 AM, Gerd Rausch <gerd.rausch@xxxxxxxxxx> wrote:
>
> Function "dma_map_sg" is entitled to merge adjacent entries
> and return a value smaller than what was passed as "nents".
>
> Subsequently "ib_map_mr_sg" needs to work with this value ("sg_dma_len")
> rather than the original "nents" parameter ("sg_len").
>
> This old RDS bug was exposed and reliably causes kernel panics
> (using RDMA operations "rds-stress -D") on x86_64 starting with:
> commit c588072bba6b ("iommu/vt-d: Convert intel iommu driver to the iommu ops")
>
> Simply put: Linux 5.11 and later.
>
> Signed-off-by: Gerd Rausch <gerd.rausch@xxxxxxxxxx>
> ---
> net/rds/ib_frmr.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
Looks good to me Gerd. Thanks !!
Acked-by: Santosh Shilimkar <santosh.shilimkar@xxxxxxxxxx>
