Miaoqing Pan <miaoqing@xxxxxxxxxxxxxx> writes: > If the interface type is P2P_DEVICE or NAN, read the file of > '/sys/kernel/debug/ieee80211/phyx/netdev:wlanx/aqm' will get a > NULL pointer dereference. As for those interface type, the > pointer sdata->vif.txq is NULL. Heh. Oops! > Unable to handle kernel NULL pointer dereference at virtual address 00000011 > CPU: 1 PID: 30936 Comm: cat Not tainted 4.14.104 #1 > task: ffffffc0337e4880 task.stack: ffffff800cd20000 > PC is at ieee80211_if_fmt_aqm+0x34/0xa0 [mac80211] > LR is at ieee80211_if_fmt_aqm+0x34/0xa0 [mac80211] > pc : [<ffffff8000b7cd00>] lr : [<ffffff8000b7cd00>] pstate: 60000145 > sp : ffffff800cd23bb0 > x29: ffffff800cd23c00 x28: ffffffc0337e4880 > x27: ffffff8008a04000 x26: 0000000000000003 > x25: 000000000000018e x24: ffffff80090f9d30 > x23: ffffffc034b62000 x22: 0000000000000000 > x21: ffffffc0335008e0 x20: ffffff800cd23c10 > x19: 00000000000000c8 x18: 0000000000000000 > x17: 0000000000000000 x16: ffffff80081ef454 > x15: 0000000000000000 x14: 00000000f45c1d27 > x13: 00000000ffab6710 x12: 0000000000000003 > x11: 0000000000000006 x10: 0000000000000000 > x9 : 0000000000000001 x8 : ffffffc0337e4880 > x7 : 0000000000000003 x6 : 00000000f4498000 > x5 : 0000000000000000 x4 : ffffff8000b7cccc > x3 : ffffff800cd23e80 x2 : 00000000000000c8 > x1 : ffffff800cd23c10 x0 : ffffffc0335008e0 > Process cat (pid: 30936, stack limit = 0xffffff800cd20000) > [Call trace: > Exception stack(0xffffff800cd23a70 to 0xffffff800cd23bb0) > 3a60: ffffffc0335008e0 ffffff800cd23c10 > 3a80: 00000000000000c8 ffffff800cd23e80 ffffff8000b7cccc 0000000000000000 > 3aa0: 00000000f4498000 0000000000000003 ffffffc0337e4880 0000000000000001 > 3ac0: 0000000000000000 0000000000000006 0000000000000003 00000000ffab6710 > 3ae0: 00000000f45c1d27 0000000000000000 ffffff80081ef454 0000000000000000 > 3b00: 0000000000000000 00000000000000c8 ffffff800cd23c10 ffffffc0335008e0 > 3b20: 0000000000000000 ffffffc034b62000 ffffff80090f9d30 000000000000018e > 3b40: 0000000000000003 ffffff8008a04000 ffffffc0337e4880 ffffff800cd23c00 > 3b60: ffffff8000b7cd00 ffffff800cd23bb0 ffffff8000b7cd00 0000000060000145 > 3b80: ffffff800cd23ba0 ffffff80088e16e4 0000007fffffffff ffffff800cd23c40 > 3ba0: ffffff800cd23c00 ffffff8000b7cd00 > [<ffffff8000b7cd00>] ieee80211_if_fmt_aqm+0x34/0xa0 [mac80211] > [<ffffff8000b7c414>] ieee80211_if_read+0x60/0xbc [mac80211] > [<ffffff8000b7ccc4>] ieee80211_if_read_aqm+0x28/0x30 [mac80211] > [<ffffff80082eff94>] full_proxy_read+0x2c/0x48 > [<ffffff80081eef00>] __vfs_read+0x2c/0xd4 > [<ffffff80081ef084>] vfs_read+0x8c/0x108 > [<ffffff80081ef494>] SyS_read+0x40/0x7c > > Tested HW: QCA9984 > Tested FW: 10.4-3.10-00047 > > Signed-off-by: Miaoqing Pan <miaoqing@xxxxxxxxxxxxxx> Acked-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>
