Hi Olga Kornievskaia, Could you check if this patch can fix your issues? https://www.spinics.net/lists/linux-rdma/msg104358.html https://www.spinics.net/lists/linux-rdma/msg104359.html https://www.spinics.net/lists/linux-rdma/msg104360.html By the way, this patch can fix my panic. Best Regards, Xiao Yang On 2021/8/20 19:15, Xiao Yang wrote: > 1) New index member of struct rxe_queue is introduced but not zeroed > so the initial value of index may be random. > 2) Current index is not masked off to index_mask. > In such case, producer_addr() and consumer_addr() will get an invalid > address by the random index and then accessing the invalid address > triggers the following panic: > "BUG: unable to handle page fault for address: ffff9ae2c07a1414" > > Fix the issue by using kzalloc() to zero out index member. > > Fixes: 5bcf5a59c41e ("RDMA/rxe: Protext kernel index from user space") > Signed-off-by: Xiao Yang <yangx.jy@xxxxxxxxxxx> > --- > drivers/infiniband/sw/rxe/rxe_queue.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/infiniband/sw/rxe/rxe_queue.c b/drivers/infiniband/sw/rxe/rxe_queue.c > index 85b812586ed4..72d95398e604 100644 > --- a/drivers/infiniband/sw/rxe/rxe_queue.c > +++ b/drivers/infiniband/sw/rxe/rxe_queue.c > @@ -63,7 +63,7 @@ struct rxe_queue *rxe_queue_init(struct rxe_dev *rxe, int *num_elem, > if (*num_elem < 0) > goto err1; > > - q = kmalloc(sizeof(*q), GFP_KERNEL); > + q = kzalloc(sizeof(*q), GFP_KERNEL); > if (!q) > goto err1; >
