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Angelos Oikonomopoulos cf18760105 arm64: Don't call NULL in do_compat_alignment_fixup() 
commit c28f31deeacda307acfee2f18c0ad904e5123aac upstream.

do_alignment_t32_to_handler() only fixes up alignment faults for
specific instructions; it returns NULL otherwise (e.g. LDREX). When
that's the case, signal to the caller that it needs to proceed with the
regular alignment fault handling (i.e. SIGBUS). Without this patch, the
kernel panics:

  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
  Mem abort info:
    ESR = 0x0000000086000006
    EC = 0x21: IABT (current EL), IL = 32 bits
    SET = 0, FnV = 0
    EA = 0, S1PTW = 0
    FSC = 0x06: level 2 translation fault
  user pgtable: 4k pages, 48-bit VAs, pgdp=00000800164aa000
  [0000000000000000] pgd=0800081fdbd22003, p4d=0800081fdbd22003, pud=08000815d51c6003, pmd=0000000000000000
  Internal error: Oops: 0000000086000006 [#1] SMP
  Modules linked in: cfg80211 rfkill xt_nat xt_tcpudp xt_conntrack nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack_netlink nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xfrm_user xfrm_algo xt_addrtype nft_compat br_netfilter veth nvme_fa>
   libcrc32c crc32c_generic raid0 multipath linear dm_mod dax raid1 md_mod xhci_pci nvme xhci_hcd nvme_core t10_pi usbcore igb crc64_rocksoft crc64 crc_t10dif crct10dif_generic crct10dif_ce crct10dif_common usb_common i2c_algo_bit i2c>
  CPU: 2 PID: 3932954 Comm: WPEWebProcess Not tainted 6.1.0-31-arm64 #1  Debian 6.1.128-1
  Hardware name: GIGABYTE MP32-AR1-00/MP32-AR1-00, BIOS F18v (SCP: 1.08.20211002) 12/01/2021
  pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
  pc : 0x0
  lr : do_compat_alignment_fixup+0xd8/0x3dc
  sp : ffff80000f973dd0
  x29: ffff80000f973dd0 x28: ffff081b42526180 x27: 0000000000000000
  x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
  x23: 0000000000000004 x22: 0000000000000000 x21: 0000000000000001
  x20: 00000000e8551f00 x19: ffff80000f973eb0 x18: 0000000000000000
  x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
  x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
  x11: 0000000000000000 x10: 0000000000000000 x9 : ffffaebc949bc488
  x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
  x5 : 0000000000400000 x4 : 0000fffffffffffe x3 : 0000000000000000
  x2 : ffff80000f973eb0 x1 : 00000000e8551f00 x0 : 0000000000000001
  Call trace:
   0x0
   do_alignment_fault+0x40/0x50
   do_mem_abort+0x4c/0xa0
   el0_da+0x48/0xf0
   el0t_32_sync_handler+0x110/0x140
   el0t_32_sync+0x190/0x194
  Code: bad PC value
  ---[ end trace 0000000000000000 ]---

Signed-off-by: Angelos Oikonomopoulos <angelos@igalia.com>
Fixes: 3fc24ef32d ("arm64: compat: Implement misalignment fixups for multiword loads")
Cc: <stable@vger.kernel.org> # 6.1.x
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20250401085150.148313-1-angelos@igalia.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-04-10 14:33:43 +02:00
..
alpha alpha/elf: Fix misc/setarch test of util-linux by removing 32bit support 2025-03-28 21:58:51 +01:00
arc ARC: build: Try to guess GCC variant of cross compiler 2025-01-09 13:30:05 +01:00
arm ARM: dts: imx6qdl-apalis: Fix poweroff on Apalis iMX6 2025-04-07 10:05:46 +02:00
arm64 arm64: Don't call NULL in do_compat_alignment_fixup() 2025-04-10 14:33:43 +02:00
csky mm: remove kern_addr_valid() completely 2024-11-08 16:26:39 +01:00
hexagon hexagon: Fix unbalanced spinlock in die() 2025-02-21 13:49:25 +01:00
ia64 mm: remove kern_addr_valid() completely 2024-11-08 16:26:39 +01:00
loongarch LoongArch: BPF: Use move_addr() for BPF_PSEUDO_FUNC 2025-04-10 14:33:41 +02:00
m68k m68k: vga: Fix I/O defines 2025-02-21 13:49:38 +01:00
microblaze microblaze: Export xmb_manager functions 2024-12-14 19:53:20 +01:00
mips ptrace: Introduce exception_ip arch hook 2025-03-07 16:56:51 +01:00
nios2 mm: remove kern_addr_valid() completely 2024-11-08 16:26:39 +01:00
openrisc mm: remove kern_addr_valid() completely 2024-11-08 16:26:39 +01:00
parisc parisc/ftrace: Fix function graph tracing disablement 2024-12-14 19:54:02 +01:00
powerpc spufs: fix a leak in spufs_create_context() 2025-04-10 14:33:40 +02:00
riscv riscv: ftrace: Add parentheses in macro definitions of make_call_t0 and make_call_ra 2025-04-10 14:33:40 +02:00
s390 s390/traps: Fix test_monitor_call() inline assembly 2025-03-13 12:53:15 +01:00
sh sh: cpuinfo: Fix a warning for CONFIG_CPUMASK_OFFSTACK 2024-12-14 19:54:03 +01:00
sparc mm: remove kern_addr_valid() completely 2024-11-08 16:26:39 +01:00
um um: remove copy_from_kernel_nofault_allowed 2025-04-10 14:33:36 +02:00
x86 x86/mm: Fix flush_tlb_range() when used for zapping normal PMDs 2025-04-10 14:33:42 +02:00
xtensa mm: remove kern_addr_valid() completely 2024-11-08 16:26:39 +01:00
.gitignore .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
Kconfig Revert "mm: mmap: allow for the maximum number of bits for randomizing mmap_base by default" 2024-06-27 13:46:24 +02:00