================================================================================ UBSAN: array-index-out-of-bounds in fs/jfs/jfs_xtree.c:622:9 index 19 is out of range for type 'xad_t[18]' (aka 'struct xad[18]') CPU: 1 PID: 25875 Comm: syz-executor.4 Not tainted 6.6.0-rc5-syzkaller-00072-g401644852d0b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:217 [inline] __ubsan_handle_out_of_bounds+0x11c/0x150 lib/ubsan.c:348 xtInsert+0xf45/0xfa0 fs/jfs/jfs_xtree.c:622 extAlloc+0xa74/0x1000 fs/jfs/jfs_extent.c:145 jfs_get_block+0x41b/0xe60 fs/jfs/inode.c:248 __block_write_begin_int+0x54d/0x1ac0 fs/buffer.c:2120 __block_write_begin fs/buffer.c:2169 [inline] block_write_begin+0x9b/0x1e0 fs/buffer.c:2228 jfs_write_begin+0x31/0x70 fs/jfs/inode.c:299 generic_perform_write+0x31b/0x630 mm/filemap.c:3969 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4090 call_write_iter include/linux/fs.h:1956 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x782/0xaf0 fs/read_write.c:584 ksys_write+0x1a0/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f62d2e7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f62d3c520c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f62d2f9bf80 RCX: 00007f62d2e7cae9 RDX: 000000000208e24b RSI: 0000000020000180 RDI: 0000000000000005 RBP: 00007f62d2ec847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f62d2f9bf80 R15: 00007fff0b394dc8 ================================================================================