syzbot


memory leak in dvb_dmxdev_add_pid

Status: upstream: reported C repro on 2026/04/26 00:22
Subsystems: media
[Documentation on labels]
Reported-by: syzbot+ba83b7db8e644b8b7c19@syzkaller.appspotmail.com
First crash: 4d11h, last: 4d11h
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] media: dvb-core: release pid memory when set filter to sec 1 (1) 2026/04/26 05:33
[syzbot] [media?] memory leak in dvb_dmxdev_add_pid 1 (3) 2026/04/26 05:32
Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/04/26 05:03 27m eadavis@qq.com patch upstream OK log

Sample crash report:
BUG: memory leak
unreferenced object 0xffff88810b771800 (size 32):
  comm "syz.0.17", pid 5923, jiffies 4294942824
  hex dump (first 32 bytes):
    02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    08 00 56 05 00 c9 ff ff 08 00 56 05 00 c9 ff ff  ..V.......V.....
  backtrace (crc 1a56a8d7):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __kmalloc_cache_noprof+0x371/0x480 mm/slub.c:5410
    kmalloc_noprof include/linux/slab.h:950 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    dvb_dmxdev_add_pid+0x9c/0x160 drivers/media/dvb-core/dmxdev.c:897
    dvb_dmxdev_pes_filter_set drivers/media/dvb-core/dmxdev.c:972 [inline]
    dvb_demux_do_ioctl+0x3c6/0x7d0 drivers/media/dvb-core/dmxdev.c:1092
    dvb_usercopy+0x116/0x2d0 drivers/media/dvb-core/dvbdev.c:996
    dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1201
    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+0xee/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff8881297f65e0 (size 32):
  comm "syz.0.18", pid 5934, jiffies 4294942829
  hex dump (first 32 bytes):
    02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    08 00 56 05 00 c9 ff ff 08 00 56 05 00 c9 ff ff  ..V.......V.....
  backtrace (crc 1a56a8d7):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __kmalloc_cache_noprof+0x371/0x480 mm/slub.c:5410
    kmalloc_noprof include/linux/slab.h:950 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    dvb_dmxdev_add_pid+0x9c/0x160 drivers/media/dvb-core/dmxdev.c:897
    dvb_dmxdev_pes_filter_set drivers/media/dvb-core/dmxdev.c:972 [inline]
    dvb_demux_do_ioctl+0x3c6/0x7d0 drivers/media/dvb-core/dmxdev.c:1092
    dvb_usercopy+0x116/0x2d0 drivers/media/dvb-core/dvbdev.c:996
    dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1201
    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+0xee/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

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

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/25 16:22 upstream 27d128c1cff6 9c2d0995 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in dvb_dmxdev_add_pid
* Struck through repros no longer work on HEAD.