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BUG: KASAN: null-ptr-deref in i_size_read include/linux/fs.h:883 [inline]
BUG: KASAN: null-ptr-deref in ext4_quota_read+0x54/0x1e2 fs/ext4/super.c:7098
Read of size 8 at addr 0000000000000050 by task syz-executor.1/14352

CPU: 1 PID: 14352 Comm: syz-executor.1 Not tainted 6.4.0-rc1-syzkaller-00012-gb104dbedbe61 #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8000aa96>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:121
[<ffffffff834dd8b4>] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:127
[<ffffffff8351d78e>] __dump_stack lib/dump_stack.c:88 [inline]
[<ffffffff8351d78e>] dump_stack_lvl+0xe0/0x14c lib/dump_stack.c:106
[<ffffffff834e49be>] print_report+0x4e4/0x502 mm/kasan/report.c:465
[<ffffffff80536714>] kasan_report+0xbc/0x182 mm/kasan/report.c:572
[<ffffffff805379c0>] check_region_inline mm/kasan/generic.c:181 [inline]
[<ffffffff805379c0>] __asan_load8+0x7e/0xa6 mm/kasan/generic.c:259
[<ffffffff8085389a>] i_size_read include/linux/fs.h:883 [inline]
[<ffffffff8085389a>] ext4_quota_read+0x54/0x1e2 fs/ext4/super.c:7098
[<ffffffff806da208>] read_blk fs/quota/quota_tree.c:55 [inline]
[<ffffffff806da208>] do_insert_tree+0x17e/0xc1c fs/quota/quota_tree.c:347
[<ffffffff806dadf4>] dq_insert_tree fs/quota/quota_tree.c:401 [inline]
[<ffffffff806dadf4>] qtree_write_dquot+0x14e/0x338 fs/quota/quota_tree.c:420
[<ffffffff806d7048>] v2_write_dquot+0xa4/0x12c fs/quota/quota_v2.c:358
[<ffffffff806cc050>] dquot_acquire+0x19e/0x2e6 fs/quota/dquot.c:444
[<ffffffff808553f8>] ext4_acquire_dquot+0x168/0x1c4 fs/ext4/super.c:6805
[<ffffffff806cda14>] dqget+0x4da/0x972 fs/quota/dquot.c:914
[<ffffffff806d14d2>] __dquot_initialize+0x33a/0x788 fs/quota/dquot.c:1492
[<ffffffff806d19d2>] dquot_initialize fs/quota/dquot.c:1550 [inline]
[<ffffffff806d19d2>] dquot_file_open fs/quota/dquot.c:2181 [inline]
[<ffffffff806d19d2>] dquot_file_open+0x8c/0x90 fs/quota/dquot.c:2175
[<ffffffff807b158a>] ext4_file_open+0x234/0xa06 fs/ext4/file.c:904
[<ffffffff80591d20>] do_dentry_open+0x3a6/0x914 fs/open.c:920
[<ffffffff805953ec>] vfs_open+0x52/0x5e fs/open.c:1051
[<ffffffff805c3210>] do_open fs/namei.c:3636 [inline]
[<ffffffff805c3210>] path_openat+0x11ea/0x164c fs/namei.c:3791
[<ffffffff805c5630>] do_filp_open+0x11c/0x246 fs/namei.c:3818
[<ffffffff80595b80>] do_sys_openat2+0x174/0x31e fs/open.c:1356
[<ffffffff80596582>] do_sys_open fs/open.c:1372 [inline]
[<ffffffff80596582>] __do_sys_openat fs/open.c:1388 [inline]
[<ffffffff80596582>] sys_openat+0xdc/0x164 fs/open.c:1383
[<ffffffff80009b3c>] syscall_handler+0xfa/0x148 arch/riscv/include/asm/syscall.h:90
[<ffffffff8351e9c2>] do_trap_ecall_u+0xea/0xec arch/riscv/kernel/traps.c:279
[<ffffffff8000621c>] ret_from_exception+0x0/0x64 arch/riscv/kernel/entry.S:102
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