================================================================== BUG: Double free or freeing an invalid pointer Unexpected shadow byte: 0xFB CPU: 1 PID: 5735 Comm: syz-executor2 Not tainted 4.9.40-g682c1e3 #12 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d92afb70 ffffffff81d8de49 ffff8801da001b40 ffff8801d67b9160 ffff8801d67b9170 ffffffff82a6f158 0000000000000282 ffff8801d92afb98 ffffffff8153805c 00000000fffffffb ffff8801da001b40 ffff8801d67b9160 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160 [] kasan_report_double_free+0x53/0x80 mm/kasan/report.c:181 [] kasan_slab_free+0x9d/0xc0 mm/kasan/kasan.c:562 [] slab_free_hook mm/slub.c:1355 [inline] [] slab_free_freelist_hook mm/slub.c:1377 [inline] [] slab_free mm/slub.c:2958 [inline] [] kfree+0xf0/0x2f0 mm/slub.c:3878 [] keychord_write+0x628/0x820 drivers/input/misc/keychord.c:319 [] __vfs_write+0x103/0x680 fs/read_write.c:510 [] vfs_write+0x170/0x4e0 fs/read_write.c:560 [] SYSC_write fs/read_write.c:607 [inline] [] SyS_write+0xd9/0x1b0 fs/read_write.c:599 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Object at ffff8801d67b9160, in cache kmalloc-16 size: 16 Allocated: PID = 5735 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598 __kmalloc+0x11d/0x310 mm/slub.c:3741 kmalloc include/linux/slab.h:495 [inline] kzalloc include/linux/slab.h:636 [inline] keychord_write+0x6d/0x820 drivers/input/misc/keychord.c:243 __vfs_write+0x103/0x680 fs/read_write.c:510 vfs_write+0x170/0x4e0 fs/read_write.c:560 SYSC_write fs/read_write.c:607 [inline] SyS_write+0xd9/0x1b0 fs/read_write.c:599 entry_SYSCALL_64_fastpath+0x23/0xc6 Freed: PID = 5744 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:571 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xf0/0x2f0 mm/slub.c:3878 keychord_write+0x15d/0x820 drivers/input/misc/keychord.c:261 __vfs_write+0x103/0x680 fs/read_write.c:510 vfs_write+0x170/0x4e0 fs/read_write.c:560 SYSC_write fs/read_write.c:607 [inline] SyS_write+0xd9/0x1b0 fs/read_write.c:599 entry_SYSCALL_64_fastpath+0x23/0xc6 ================================================================== keychord: unsupported version 40 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=5706 sclass=netlink_tcpdiag_socket pig=5776 comm=syz-executor1 device lo entered promiscuous mode device syz0 left promiscuous mode SELinux: unrecognized netlink message: protocol=4 nlmsg_type=5706 sclass=netlink_tcpdiag_socket pig=6641 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=5706 sclass=netlink_tcpdiag_socket pig=6681 comm=syz-executor0 nla_parse: 38 callbacks suppressed netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor3'. IPv6: : Disabled Multicast RS netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor3'. binder: 7569:7575 ioctl c058534b 20416000 returned -22 binder: 7569:7585 ioctl c058534b 20416000 returned -22 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=7574 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=7605 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12 sclass=netlink_route_socket pig=7815 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12 sclass=netlink_route_socket pig=7827 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=51457 sclass=netlink_route_socket pig=8018 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=51457 sclass=netlink_route_socket pig=8047 comm=syz-executor5 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=24 sclass=netlink_tcpdiag_socket pig=8094 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=24 sclass=netlink_tcpdiag_socket pig=8107 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=43050 sclass=netlink_route_socket pig=8135 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=65434 sclass=netlink_route_socket pig=8210 comm=syz-executor4 IPv6: Can't replace route, no match found IPv6: Can't replace route, no match found IPv6: Can't replace route, no match found IPv6: Can't replace route, no match found IPv6: Can't replace route, no match found IPv6: Can't replace route, no match found nla_parse: 124 callbacks suppressed netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor0'.