Patch "apparmor: fix possible NULL pointer dereference" has been added to the 4.19-stable tree

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This is a note to let you know that I've just added the patch titled

    apparmor: fix possible NULL pointer dereference

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     apparmor-fix-possible-null-pointer-dereference.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit b2783934765b7d4a053537a4971b91d482c4fd4a
Author: Leesoo Ahn <lsahn@xxxxxxxxxx>
Date:   Wed May 8 01:12:29 2024 +0900

    apparmor: fix possible NULL pointer dereference
    
    [ Upstream commit 3dd384108d53834002be5630132ad5c3f32166ad ]
    
    profile->parent->dents[AAFS_PROF_DIR] could be NULL only if its parent is made
    from __create_missing_ancestors(..) and 'ent->old' is NULL in
    aa_replace_profiles(..).
    In that case, it must return an error code and the code, -ENOENT represents
    its state that the path of its parent is not existed yet.
    
    BUG: kernel NULL pointer dereference, address: 0000000000000030
    PGD 0 P4D 0
    PREEMPT SMP PTI
    CPU: 4 PID: 3362 Comm: apparmor_parser Not tainted 6.8.0-24-generic #24
    Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
    RIP: 0010:aafs_create.constprop.0+0x7f/0x130
    Code: 4c 63 e0 48 83 c4 18 4c 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d 31 d2 31 c9 31 f6 31 ff 45 31 c0 45 31 c9 45 31 d2 c3 cc cc cc cc <4d> 8b 55 30 4d 8d ba a0 00 00 00 4c 89 55 c0 4c 89 ff e8 7a 6a ae
    RSP: 0018:ffffc9000b2c7c98 EFLAGS: 00010246
    RAX: 0000000000000000 RBX: 00000000000041ed RCX: 0000000000000000
    RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
    RBP: ffffc9000b2c7cd8 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82baac10
    R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
    FS:  00007be9f22cf740(0000) GS:ffff88817bc00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000030 CR3: 0000000134b08000 CR4: 00000000000006f0
    Call Trace:
     <TASK>
     ? show_regs+0x6d/0x80
     ? __die+0x24/0x80
     ? page_fault_oops+0x99/0x1b0
     ? kernelmode_fixup_or_oops+0xb2/0x140
     ? __bad_area_nosemaphore+0x1a5/0x2c0
     ? find_vma+0x34/0x60
     ? bad_area_nosemaphore+0x16/0x30
     ? do_user_addr_fault+0x2a2/0x6b0
     ? exc_page_fault+0x83/0x1b0
     ? asm_exc_page_fault+0x27/0x30
     ? aafs_create.constprop.0+0x7f/0x130
     ? aafs_create.constprop.0+0x51/0x130
     __aafs_profile_mkdir+0x3d6/0x480
     aa_replace_profiles+0x83f/0x1270
     policy_update+0xe3/0x180
     profile_load+0xbc/0x150
     ? rw_verify_area+0x47/0x140
     vfs_write+0x100/0x480
     ? __x64_sys_openat+0x55/0xa0
     ? syscall_exit_to_user_mode+0x86/0x260
     ksys_write+0x73/0x100
     __x64_sys_write+0x19/0x30
     x64_sys_call+0x7e/0x25c0
     do_syscall_64+0x7f/0x180
     entry_SYSCALL_64_after_hwframe+0x78/0x80
    RIP: 0033:0x7be9f211c574
    Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d d5 ea 0e 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
    RSP: 002b:00007ffd26f2b8c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
    RAX: ffffffffffffffda RBX: 00005d504415e200 RCX: 00007be9f211c574
    RDX: 0000000000001fc1 RSI: 00005d504418bc80 RDI: 0000000000000004
    RBP: 0000000000001fc1 R08: 0000000000001fc1 R09: 0000000080000000
    R10: 0000000000000000 R11: 0000000000000202 R12: 00005d504418bc80
    R13: 0000000000000004 R14: 00007ffd26f2b9b0 R15: 00007ffd26f2ba30
     </TASK>
    Modules linked in: snd_seq_dummy snd_hrtimer qrtr snd_hda_codec_generic snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device i2c_i801 snd_timer i2c_smbus qxl snd soundcore drm_ttm_helper lpc_ich ttm joydev input_leds serio_raw mac_hid binfmt_misc msr parport_pc ppdev lp parport efi_pstore nfnetlink dmi_sysfs qemu_fw_cfg ip_tables x_tables autofs4 hid_generic usbhid hid ahci libahci psmouse virtio_rng xhci_pci xhci_pci_renesas
    CR2: 0000000000000030
    ---[ end trace 0000000000000000 ]---
    RIP: 0010:aafs_create.constprop.0+0x7f/0x130
    Code: 4c 63 e0 48 83 c4 18 4c 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d 31 d2 31 c9 31 f6 31 ff 45 31 c0 45 31 c9 45 31 d2 c3 cc cc cc cc <4d> 8b 55 30 4d 8d ba a0 00 00 00 4c 89 55 c0 4c 89 ff e8 7a 6a ae
    RSP: 0018:ffffc9000b2c7c98 EFLAGS: 00010246
    RAX: 0000000000000000 RBX: 00000000000041ed RCX: 0000000000000000
    RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
    RBP: ffffc9000b2c7cd8 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82baac10
    R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
    FS:  00007be9f22cf740(0000) GS:ffff88817bc00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000030 CR3: 0000000134b08000 CR4: 00000000000006f0
    
    Signed-off-by: Leesoo Ahn <lsahn@xxxxxxxxxx>
    Signed-off-by: John Johansen <john.johansen@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 80012d21f038..1223b2648a54 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -1593,6 +1593,10 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
 		struct aa_profile *p;
 		p = aa_deref_parent(profile);
 		dent = prof_dir(p);
+		if (!dent) {
+			error = -ENOENT;
+			goto fail2;
+		}
 		/* adding to parent that previously didn't have children */
 		dent = aafs_create_dir("profiles", dent);
 		if (IS_ERR(dent))




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