From: Leon Romanovsky leonro@mellanox.com

[ 61.182439] UBSAN: Undefined behaviour in drivers/infiniband/hw/mlx5/qp.c:5366:34 [ 61.183673] shift exponent 4294967288 is too large for 32-bit type 'unsigned int' [ 61.185530] CPU: 0 PID: 639 Comm: qp Not tainted 4.18.0-rc1-00037-g4aa1d69a9c60-dirty #96 [ 61.186981] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-2.fc27 04/01/2014 [ 61.188315] Call Trace: [ 61.188661] dump_stack+0xc7/0x13b [ 61.190427] ubsan_epilogue+0x9/0x49 [ 61.190899] __ubsan_handle_shift_out_of_bounds+0x1ea/0x22f [ 61.197040] mlx5_ib_create_wq+0x1c99/0x1d50 [ 61.206632] ib_uverbs_ex_create_wq+0x499/0x820 [ 61.213892] ib_uverbs_write+0x77e/0xae0 [ 61.248018] vfs_write+0x121/0x3b0 [ 61.249831] ksys_write+0xa1/0x120 [ 61.254024] do_syscall_64+0x7c/0x2a0 [ 61.256178] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.259211] RIP: 0033:0x7f54bab70e99 [ 61.262125] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 [ 61.268678] RSP: 002b:00007ffe1541c318 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 61.271076] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f54bab70e99 [ 61.273795] RDX: 0000000000000070 RSI: 0000000020000240 RDI: 0000000000000003 [ 61.276982] RBP: 00007ffe1541c330 R08: 00000000200078e0 R09: 0000000000000002 [ 61.280035] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004005c0 [ 61.283279] R13: 00007ffe1541c420 R14: 0000000000000000 R15: 0000000000000000

Cc: stable@vger.kernel.org # 4.7 Fixes: 79b20a6c3014 ("IB/mlx5: Add receive Work Queue verbs") Cc: syzkaller syzkaller@googlegroups.com Reported-by: Noa Osherovich noaos@mellanox.com Signed-off-by: Leon Romanovsky leonro@mellanox.com Signed-off-by: Kees Cook keescook@chromium.org --- drivers/infiniband/hw/mlx5/qp.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c index a4f1f638509f..7fc156db643d 100644 --- a/drivers/infiniband/hw/mlx5/qp.c +++ b/drivers/infiniband/hw/mlx5/qp.c @@ -5365,7 +5365,10 @@ static int set_user_rq_size(struct mlx5_ib_dev *dev,

rwq->wqe_count = ucmd->rq_wqe_count; rwq->wqe_shift = ucmd->rq_wqe_shift; - rwq->buf_size = (rwq->wqe_count << rwq->wqe_shift); + if (check_shift_overflow(rwq->wqe_count, rwq->wqe_shift, + &rwq->buf_size)) + return -EINVAL; + rwq->log_rq_stride = rwq->wqe_shift; rwq->log_rq_size = ilog2(rwq->wqe_count); return 0;