Re: [PATCH net] net_sched: avoid shift-out-of-bounds in tcindex_set_parms()

Hello: This patch was applied to netdev/net.git (refs/heads/master): On Thu, 14 Jan 2021 10:52:29 -0800 you wrote: > From: Eric Dumazet > > tc_index being 16bit wide, we need to check that TCA_TCINDEX_SHIFT > attribute is not silly. > > UBSAN: shift-out-of-bounds in net/sched/cls_tcindex.c:260

[PATCH net] net_sched: avoid shift-out-of-bounds in tcindex_set_parms()

From: Eric Dumazet tc_index being 16bit wide, we need to check that TCA_TCINDEX_SHIFT attribute is not silly. UBSAN: shift-out-of-bounds in net/sched/cls_tcindex.c:260:29 shift exponent 255 is too large for 32-bit type 'int' CPU: 0 PID: 8516 Comm: syz-executor228 Not tainted 5.10.0-syzkaller #0