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memory leak in fbcon_set_font

Status: auto-obsoleted due to no activity on 2022/10/03 19:40
Subsystems: fbdev
[Documentation on labels]
Reported-by: syzbot+2f2c18881a450f22d1bf@syzkaller.appspotmail.com
First crash: 1648d, last: 1648d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
memory leak in fbcon_set_font 0 (1) 2021/01/13 10:38
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream memory leak in fbcon_set_font (2) fbdev 3 C 1 957d 957d 22/29 fixed on 2023/02/24 13:50
upstream memory leak in fbcon_set_font (3) fbdev 3 C 1 580d 786d 0/29 upstream: reported C repro on 2023/05/25 11:17
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2022/10/03 18:30 16m retest repro upstream OK log
2021/03/24 23:42 15m phil@philpotter.co.uk upstream OK

Sample crash report:
BUG: memory leak
unreferenced object 0xffff88811813ea00 (size 512):
  comm "syz-executor939", pid 10246, jiffies 4294971847 (age 34.510s)
  hex dump (first 32 bytes):
    b0 55 1f 9b 00 00 00 00 00 01 00 00 06 00 00 00  .U..............
    11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000062fad90>] kmalloc include/linux/slab.h:557 [inline]
    [<00000000062fad90>] fbcon_set_font+0x128/0x370 drivers/video/fbdev/core/fbcon.c:2454
    [<00000000ed2d1b1e>] con_font_set drivers/tty/vt/vt.c:4667 [inline]
    [<00000000ed2d1b1e>] con_font_op+0x497/0x740 drivers/tty/vt/vt.c:4711
    [<00000000fd6b18ad>] vt_io_ioctl drivers/tty/vt/vt_ioctl.c:596 [inline]
    [<00000000fd6b18ad>] vt_ioctl+0xeab/0x19d0 drivers/tty/vt/vt_ioctl.c:817
    [<00000000369331c6>] tty_ioctl+0x6c3/0xc40 drivers/tty/tty_io.c:2658
    [<00000000a092c047>] vfs_ioctl fs/ioctl.c:48 [inline]
    [<00000000a092c047>] __do_sys_ioctl fs/ioctl.c:753 [inline]
    [<00000000a092c047>] __se_sys_ioctl fs/ioctl.c:739 [inline]
    [<00000000a092c047>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:739
    [<00000000705a3959>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000f35163f9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811813ea00 (size 512):
  comm "syz-executor939", pid 10246, jiffies 4294971847 (age 36.030s)
  hex dump (first 32 bytes):
    b0 55 1f 9b 00 00 00 00 00 01 00 00 06 00 00 00  .U..............
    11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000062fad90>] kmalloc include/linux/slab.h:557 [inline]
    [<00000000062fad90>] fbcon_set_font+0x128/0x370 drivers/video/fbdev/core/fbcon.c:2454
    [<00000000ed2d1b1e>] con_font_set drivers/tty/vt/vt.c:4667 [inline]
    [<00000000ed2d1b1e>] con_font_op+0x497/0x740 drivers/tty/vt/vt.c:4711
    [<00000000fd6b18ad>] vt_io_ioctl drivers/tty/vt/vt_ioctl.c:596 [inline]
    [<00000000fd6b18ad>] vt_ioctl+0xeab/0x19d0 drivers/tty/vt/vt_ioctl.c:817
    [<00000000369331c6>] tty_ioctl+0x6c3/0xc40 drivers/tty/tty_io.c:2658
    [<00000000a092c047>] vfs_ioctl fs/ioctl.c:48 [inline]
    [<00000000a092c047>] __do_sys_ioctl fs/ioctl.c:753 [inline]
    [<00000000a092c047>] __se_sys_ioctl fs/ioctl.c:739 [inline]
    [<00000000a092c047>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:739
    [<00000000705a3959>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000f35163f9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811813ea00 (size 512):
  comm "syz-executor939", pid 10246, jiffies 4294971847 (age 37.550s)
  hex dump (first 32 bytes):
    b0 55 1f 9b 00 00 00 00 00 01 00 00 06 00 00 00  .U..............
    11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000062fad90>] kmalloc include/linux/slab.h:557 [inline]
    [<00000000062fad90>] fbcon_set_font+0x128/0x370 drivers/video/fbdev/core/fbcon.c:2454
    [<00000000ed2d1b1e>] con_font_set drivers/tty/vt/vt.c:4667 [inline]
    [<00000000ed2d1b1e>] con_font_op+0x497/0x740 drivers/tty/vt/vt.c:4711
    [<00000000fd6b18ad>] vt_io_ioctl drivers/tty/vt/vt_ioctl.c:596 [inline]
    [<00000000fd6b18ad>] vt_ioctl+0xeab/0x19d0 drivers/tty/vt/vt_ioctl.c:817
    [<00000000369331c6>] tty_ioctl+0x6c3/0xc40 drivers/tty/tty_io.c:2658
    [<00000000a092c047>] vfs_ioctl fs/ioctl.c:48 [inline]
    [<00000000a092c047>] __do_sys_ioctl fs/ioctl.c:753 [inline]
    [<00000000a092c047>] __se_sys_ioctl fs/ioctl.c:739 [inline]
    [<00000000a092c047>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:739
    [<00000000705a3959>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000f35163f9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811813ea00 (size 512):
  comm "syz-executor939", pid 10246, jiffies 4294971847 (age 37.630s)
  hex dump (first 32 bytes):
    b0 55 1f 9b 00 00 00 00 00 01 00 00 06 00 00 00  .U..............
    11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000062fad90>] kmalloc include/linux/slab.h:557 [inline]
    [<00000000062fad90>] fbcon_set_font+0x128/0x370 drivers/video/fbdev/core/fbcon.c:2454
    [<00000000ed2d1b1e>] con_font_set drivers/tty/vt/vt.c:4667 [inline]
    [<00000000ed2d1b1e>] con_font_op+0x497/0x740 drivers/tty/vt/vt.c:4711
    [<00000000fd6b18ad>] vt_io_ioctl drivers/tty/vt/vt_ioctl.c:596 [inline]
    [<00000000fd6b18ad>] vt_ioctl+0xeab/0x19d0 drivers/tty/vt/vt_ioctl.c:817
    [<00000000369331c6>] tty_ioctl+0x6c3/0xc40 drivers/tty/tty_io.c:2658
    [<00000000a092c047>] vfs_ioctl fs/ioctl.c:48 [inline]
    [<00000000a092c047>] __do_sys_ioctl fs/ioctl.c:753 [inline]
    [<00000000a092c047>] __se_sys_ioctl fs/ioctl.c:739 [inline]
    [<00000000a092c047>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:739
    [<00000000705a3959>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000f35163f9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811813ea00 (size 512):
  comm "syz-executor939", pid 10246, jiffies 4294971847 (age 37.720s)
  hex dump (first 32 bytes):
    b0 55 1f 9b 00 00 00 00 00 01 00 00 06 00 00 00  .U..............
    11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000062fad90>] kmalloc include/linux/slab.h:557 [inline]
    [<00000000062fad90>] fbcon_set_font+0x128/0x370 drivers/video/fbdev/core/fbcon.c:2454
    [<00000000ed2d1b1e>] con_font_set drivers/tty/vt/vt.c:4667 [inline]
    [<00000000ed2d1b1e>] con_font_op+0x497/0x740 drivers/tty/vt/vt.c:4711
    [<00000000fd6b18ad>] vt_io_ioctl drivers/tty/vt/vt_ioctl.c:596 [inline]
    [<00000000fd6b18ad>] vt_ioctl+0xeab/0x19d0 drivers/tty/vt/vt_ioctl.c:817
    [<00000000369331c6>] tty_ioctl+0x6c3/0xc40 drivers/tty/tty_io.c:2658
    [<00000000a092c047>] vfs_ioctl fs/ioctl.c:48 [inline]
    [<00000000a092c047>] __do_sys_ioctl fs/ioctl.c:753 [inline]
    [<00000000a092c047>] __se_sys_ioctl fs/ioctl.c:739 [inline]
    [<00000000a092c047>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:739
    [<00000000705a3959>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000f35163f9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811813ea00 (size 512):
  comm "syz-executor939", pid 10246, jiffies 4294971847 (age 37.810s)
  hex dump (first 32 bytes):
    b0 55 1f 9b 00 00 00 00 00 01 00 00 06 00 00 00  .U..............
    11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000062fad90>] kmalloc include/linux/slab.h:557 [inline]
    [<00000000062fad90>] fbcon_set_font+0x128/0x370 drivers/video/fbdev/core/fbcon.c:2454
    [<00000000ed2d1b1e>] con_font_set drivers/tty/vt/vt.c:4667 [inline]
    [<00000000ed2d1b1e>] con_font_op+0x497/0x740 drivers/tty/vt/vt.c:4711
    [<00000000fd6b18ad>] vt_io_ioctl drivers/tty/vt/vt_ioctl.c:596 [inline]
    [<00000000fd6b18ad>] vt_ioctl+0xeab/0x19d0 drivers/tty/vt/vt_ioctl.c:817
    [<00000000369331c6>] tty_ioctl+0x6c3/0xc40 drivers/tty/tty_io.c:2658
    [<00000000a092c047>] vfs_ioctl fs/ioctl.c:48 [inline]
    [<00000000a092c047>] __do_sys_ioctl fs/ioctl.c:753 [inline]
    [<00000000a092c047>] __se_sys_ioctl fs/ioctl.c:739 [inline]
    [<00000000a092c047>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:739
    [<00000000705a3959>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000f35163f9>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
executing program
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
executing program
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/01/13 08:51 upstream e609571b5ffa 0cdd6185 .config console log report syz C ci-upstream-gce-leak
* Struck through repros no longer work on HEAD.