UBSAN: shift-out-of-bounds in e100_eeprom_load

Status: upstream: reported on 2026/08/17 09:53
Reported-by: syzbot+32e2f0c1ca540d527d6d@syzkaller.appspotmail.com
First crash: 5d01h, last: 5d01h
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream UBSAN: shift-out-of-bounds in e100_eeprom_load intel-wired-lan prio:low -1 syz, C 26 5d03h 15d 0/29 upstream: reported C repro on 2026/08/06 15:36

Sample crash report:
0000:00:01.0 (uninitialized): Cannot find proper PCI device base address, aborting
================================================================================
UBSAN: shift-out-of-bounds in drivers/net/ethernet/intel/e100.c:766:21
shift exponent 65529 is too large for 32-bit type 'int'
CPU: 1 PID: 5377 Comm: syz.1.358 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 ubsan_epilogue+0x14/0x48 lib/ubsan.c:151
 __ubsan_handle_shift_out_of_bounds+0x2b0/0x348 lib/ubsan.c:321
 e100_eeprom_load+0x3c4/0x46c drivers/net/ethernet/intel/e100.c:766
 e100_probe+0x6f0/0xeb4 drivers/net/ethernet/intel/e100.c:2919
 local_pci_probe drivers/pci/pci-driver.c:324 [inline]
 pci_call_probe drivers/pci/pci-driver.c:392 [inline]
 __pci_device_probe drivers/pci/pci-driver.c:417 [inline]
 pci_device_probe+0x4ac/0x7d0 drivers/pci/pci-driver.c:460
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x3a0/0xac4 drivers/base/dd.c:638
 __driver_probe_device+0x1c8/0x368 drivers/base/dd.c:804
 device_driver_attach+0xbc/0x1a4 drivers/base/dd.c:1131
 bind_store+0x2e4/0x318 drivers/base/bus.c:216
 drv_attr_store+0x80/0xa4 drivers/base/bus.c:77
 sysfs_kf_write+0x1f8/0x274 fs/sysfs/file.c:140
 kernfs_fop_write_iter+0x390/0x4b4 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x3c8/0x7c8 fs/read_write.c:584
 ksys_write+0x12c/0x228 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
================================================================================
================================================================================
UBSAN: array-index-out-of-bounds in drivers/net/ethernet/intel/e100.c:776:40
index -1 is out of range for type '__le16[256]' (aka 'unsigned short[256]')
CPU: 1 PID: 5377 Comm: syz.1.358 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 ubsan_epilogue+0x14/0x48 lib/ubsan.c:151
 __ubsan_handle_out_of_bounds+0xd0/0xf8 lib/ubsan.c:282
 e100_eeprom_load+0x3f4/0x46c drivers/net/ethernet/intel/e100.c:776
 e100_probe+0x6f0/0xeb4 drivers/net/ethernet/intel/e100.c:2919
 local_pci_probe drivers/pci/pci-driver.c:324 [inline]
 pci_call_probe drivers/pci/pci-driver.c:392 [inline]
 __pci_device_probe drivers/pci/pci-driver.c:417 [inline]
 pci_device_probe+0x4ac/0x7d0 drivers/pci/pci-driver.c:460
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x3a0/0xac4 drivers/base/dd.c:638
 __driver_probe_device+0x1c8/0x368 drivers/base/dd.c:804
 device_driver_attach+0xbc/0x1a4 drivers/base/dd.c:1131
 bind_store+0x2e4/0x318 drivers/base/bus.c:216
 drv_attr_store+0x80/0xa4 drivers/base/bus.c:77
 sysfs_kf_write+0x1f8/0x274 fs/sysfs/file.c:140
 kernfs_fop_write_iter+0x390/0x4b4 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x3c8/0x7c8 fs/read_write.c:584
 ksys_write+0x12c/0x228 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
================================================================================
e100 0000:00:02.0 0000:00:02.0 (uninitialized): EEPROM corrupted
e100: probe of 0000:00:02.0 failed with error -11

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/17 09:52 linux-6.1.y e4f7d8be268e 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 UBSAN: shift-out-of-bounds in e100_eeprom_load
* Struck through repros no longer work on HEAD.