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BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0x9c/0xb0 mm/kmsan/kmsan_hooks.c:249
CPU: 0 PID: 8206 Comm: syz-executor610 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 kmsan_internal_check_memory+0x484/0x520 mm/kmsan/kmsan.c:437
 kmsan_copy_to_user+0x9c/0xb0 mm/kmsan/kmsan_hooks.c:249
 instrument_copy_to_user include/linux/instrumented.h:121 [inline]
 _copy_to_user+0x1ac/0x270 lib/usercopy.c:33
 copy_to_user include/linux/uaccess.h:209 [inline]
 i2cdev_read+0x23d/0x350 drivers/i2c/i2c-dev.c:153
 vfs_read+0x533/0x15a0 fs/read_write.c:494
 ksys_read+0x275/0x500 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read+0x92/0xb0 fs/read_write.c:642
 __x64_sys_read+0x4a/0x70 fs/read_write.c:642
 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x444189
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc32d51068 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 0000000000444189
RDX: 0000000000001000 RSI: 0000000020000480 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00232d6332692f76 R09: 00007ffc32d51208
R10: 000000000000000f R11: 0000000000000246 R12: 00000000004034a0
R13: 431bde82d7b634db R14: 00000000004b2018 R15: 00000000004004a0

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 slab_alloc mm/slub.c:2916 [inline]
 __kmalloc+0x378/0x560 mm/slub.c:3998
 kmalloc include/linux/slab.h:557 [inline]
 i2cdev_read+0x128/0x350 drivers/i2c/i2c-dev.c:144
 vfs_read+0x533/0x15a0 fs/read_write.c:494
 ksys_read+0x275/0x500 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read+0x92/0xb0 fs/read_write.c:642
 __x64_sys_read+0x4a/0x70 fs/read_write.c:642
 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Bytes 0-4095 of 4096 are uninitialized
Memory access of size 4096 starts at ffff88812e48b000
Data copied to user address 0000000020000480
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