[syzbot] [dri?] memory leak in drm_mode_atomic_ioctl

[syzbot <syzbot+3fc9eecaf97147282c87@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    6bda50f4333f Merge tag 'mips-fixes_6.18_2' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17ab8512580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f30cc590c4f6da44
dashboard link: https://syzkaller.appspot.com/bug?extid=3fc9eecaf97147282c87
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14447cb4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1094d508580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/864951cecf67/disk-6bda50f4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4692a21b76e7/vmlinux-6bda50f4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a2898beb8301/bzImage-6bda50f4.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3fc9eecaf97147282c87@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff888125711880 (size 128):
  comm "syz.0.18", pid 6089, jiffies 4294942955
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc f5a89fc0):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    __kmalloc_cache_noprof+0x3a6/0x5b0 mm/slub.c:5766
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    create_vblank_event drivers/gpu/drm/drm_atomic_uapi.c:931 [inline]
    prepare_signaling drivers/gpu/drm/drm_atomic_uapi.c:1221 [inline]
    drm_mode_atomic_ioctl+0x924/0x13d0 drivers/gpu/drm/drm_atomic_uapi.c:1529
    drm_ioctl_kernel+0x125/0x1f0 drivers/gpu/drm/drm_ioctl.c:797
    drm_ioctl+0x371/0x6b0 drivers/gpu/drm/drm_ioctl.c:894
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888125711780 (size 128):
  comm "syz.0.19", pid 6092, jiffies 4294942957
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc f5a89fc0):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    __kmalloc_cache_noprof+0x3a6/0x5b0 mm/slub.c:5766
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    create_vblank_event drivers/gpu/drm/drm_atomic_uapi.c:931 [inline]
    prepare_signaling drivers/gpu/drm/drm_atomic_uapi.c:1221 [inline]
    drm_mode_atomic_ioctl+0x924/0x13d0 drivers/gpu/drm/drm_atomic_uapi.c:1529
    drm_ioctl_kernel+0x125/0x1f0 drivers/gpu/drm/drm_ioctl.c:797
    drm_ioctl+0x371/0x6b0 drivers/gpu/drm/drm_ioctl.c:894
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888125711700 (size 128):
  comm "syz.0.20", pid 6121, jiffies 4294943534
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc f5a89fc0):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    __kmalloc_cache_noprof+0x3a6/0x5b0 mm/slub.c:5766
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    create_vblank_event drivers/gpu/drm/drm_atomic_uapi.c:931 [inline]
    prepare_signaling drivers/gpu/drm/drm_atomic_uapi.c:1221 [inline]
    drm_mode_atomic_ioctl+0x924/0x13d0 drivers/gpu/drm/drm_atomic_uapi.c:1529
    drm_ioctl_kernel+0x125/0x1f0 drivers/gpu/drm/drm_ioctl.c:797
    drm_ioctl+0x371/0x6b0 drivers/gpu/drm/drm_ioctl.c:894
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff8881266fab80 (size 128):
  comm "syz.0.21", pid 6122, jiffies 4294943536
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc f5a89fc0):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    __kmalloc_cache_noprof+0x3a6/0x5b0 mm/slub.c:5766
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    create_vblank_event drivers/gpu/drm/drm_atomic_uapi.c:931 [inline]
    prepare_signaling drivers/gpu/drm/drm_atomic_uapi.c:1221 [inline]
    drm_mode_atomic_ioctl+0x924/0x13d0 drivers/gpu/drm/drm_atomic_uapi.c:1529
    drm_ioctl_kernel+0x125/0x1f0 drivers/gpu/drm/drm_ioctl.c:797
    drm_ioctl+0x371/0x6b0 drivers/gpu/drm/drm_ioctl.c:894
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


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