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Paulo Alcantara 6726429c18 smb: client: fix potential OOBs in smb2_parse_contexts() 
commit af1689a9b7 upstream.

Validate offsets and lengths before dereferencing create contexts in
smb2_parse_contexts().

This fixes following oops when accessing invalid create contexts from
server:

  BUG: unable to handle page fault for address: ffff8881178d8cc3
  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  PGD 4a01067 P4D 4a01067 PUD 0
  Oops: 0000 [#1] PREEMPT SMP NOPTI
  CPU: 3 PID: 1736 Comm: mount.cifs Not tainted 6.7.0-rc4 #1
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
  rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014
  RIP: 0010:smb2_parse_contexts+0xa0/0x3a0 [cifs]
  Code: f8 10 75 13 48 b8 93 ad 25 50 9c b4 11 e7 49 39 06 0f 84 d2 00
  00 00 8b 45 00 85 c0 74 61 41 29 c5 48 01 c5 41 83 fd 0f 76 55 <0f> b7
  7d 04 0f b7 45 06 4c 8d 74 3d 00 66 83 f8 04 75 bc ba 04 00
  RSP: 0018:ffffc900007939e0 EFLAGS: 00010216
  RAX: ffffc90000793c78 RBX: ffff8880180cc000 RCX: ffffc90000793c90
  RDX: ffffc90000793cc0 RSI: ffff8880178d8cc0 RDI: ffff8880180cc000
  RBP: ffff8881178d8cbf R08: ffffc90000793c22 R09: 0000000000000000
  R10: ffff8880180cc000 R11: 0000000000000024 R12: 0000000000000000
  R13: 0000000000000020 R14: 0000000000000000 R15: ffffc90000793c22
  FS: 00007f873753cbc0(0000) GS:ffff88806bc00000(0000)
  knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: ffff8881178d8cc3 CR3: 00000000181ca000 CR4: 0000000000750ef0
  PKRU: 55555554
  Call Trace:
   <TASK>
   ? __die+0x23/0x70
   ? page_fault_oops+0x181/0x480
   ? search_module_extables+0x19/0x60
   ? srso_alias_return_thunk+0x5/0xfbef5
   ? exc_page_fault+0x1b6/0x1c0
   ? asm_exc_page_fault+0x26/0x30
   ? smb2_parse_contexts+0xa0/0x3a0 [cifs]
   SMB2_open+0x38d/0x5f0 [cifs]
   ? smb2_is_path_accessible+0x138/0x260 [cifs]
   smb2_is_path_accessible+0x138/0x260 [cifs]
   cifs_is_path_remote+0x8d/0x230 [cifs]
   cifs_mount+0x7e/0x350 [cifs]
   cifs_smb3_do_mount+0x128/0x780 [cifs]
   smb3_get_tree+0xd9/0x290 [cifs]
   vfs_get_tree+0x2c/0x100
   ? capable+0x37/0x70
   path_mount+0x2d7/0xb80
   ? srso_alias_return_thunk+0x5/0xfbef5
   ? _raw_spin_unlock_irqrestore+0x44/0x60
   __x64_sys_mount+0x11a/0x150
   do_syscall_64+0x47/0xf0
   entry_SYSCALL_64_after_hwframe+0x6f/0x77
  RIP: 0033:0x7f8737657b1e

Reported-by: Robert Morris <rtm@csail.mit.edu>
Cc: stable@vger.kernel.org
Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
[Guru: Removed changes to cached_dir.c and checking return value
of smb2_parse_contexts in smb2ops.c]
Signed-off-by: Guruswamy Basavaiah <guruswamy.basavaiah@broadcom.com>
[v5.4: Fixed merge-conflicts in smb2_parse_contexts for
missing parameter POSIX response]
Signed-off-by: Shaoying Xu <shaoyi@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2024-05-25 16:17:17 +02:00
..
Kconfig
…
Makefile
…
asn1.c
…
cache.c
…
cifs_debug.c
…
cifs_debug.h
…
cifs_dfs_ref.c
…
cifs_fs_sb.h
…
cifs_ioctl.h
…
cifs_spnego.c cifs: spnego: add ';' in HOST_KEY_LEN 2023-11-28 16:50:17 +00:00
cifs_spnego.h
…
cifs_unicode.c
…
cifs_unicode.h
…
cifs_uniupr.h
…
cifsacl.c SMB3: Backup intent flag missing from some more ops 2023-03-17 08:32:50 +01:00
cifsacl.h
…
cifsencrypt.c
…
cifsfs.c cifs: Fix non-availability of dedup breaking generic/304 2023-12-13 18:18:17 +01:00
cifsfs.h cifs: fix DFS traversal oops without CONFIG_CIFS_DFS_UPCALL 2023-04-05 11:16:45 +02:00
cifsglob.h SMB3: Backup intent flag missing from some more ops 2023-03-17 08:32:50 +01:00
cifspdu.h
…
cifsproto.h smb3: fix problem with null cifs super block with previous patch 2023-04-20 12:07:32 +02:00
cifsroot.c
…
cifssmb.c cifs: prevent infinite recursion in CIFSGetDFSRefer() 2023-04-05 11:16:45 +02:00
connect.c cifs: handle empty list of targets in cifs_reconnect() 2023-06-14 10:59:59 +02:00
dfs_cache.c cifs: Fix potential deadlock when updating vol in cifs_reconnect() 2023-06-28 10:18:37 +02:00
dfs_cache.h
…
dir.c SMB3: Backup intent flag missing from some more ops 2023-03-17 08:32:50 +01:00
dns_resolve.c
…
dns_resolve.h
…
export.c
…
file.c cifs: Release folio lock on fscache read hit. 2023-08-30 16:27:19 +02:00
fscache.c
…
fscache.h
…
inode.c SMB3: Backup intent flag missing from some more ops 2023-03-17 08:32:50 +01:00
ioctl.c SMB3: Backup intent flag missing from some more ops 2023-03-17 08:32:50 +01:00
link.c SMB3: Backup intent flag missing from some more ops 2023-03-17 08:32:50 +01:00
misc.c smb: client: fix OOB in smbCalcSize() 2024-01-08 11:29:47 +01:00
netmisc.c
…
nterr.c
…
nterr.h
…
ntlmssp.h
…
readdir.c
…
rfc1002pdu.h
…
sess.c
…
smb1ops.c SMB3: Backup intent flag missing from some more ops 2023-03-17 08:32:50 +01:00
smb2file.c
…
smb2glob.h
…
smb2inode.c SMB3: Backup intent flag missing from some more ops 2023-03-17 08:32:50 +01:00
smb2maperror.c
…
smb2misc.c smb: client: fix NULL deref in asn1_ber_decoder() 2024-01-08 11:29:45 +01:00
smb2ops.c smb: client: fix potential OOBs in smb2_parse_contexts() 2024-05-25 16:17:17 +02:00
smb2pdu.c smb: client: fix potential OOBs in smb2_parse_contexts() 2024-05-25 16:17:17 +02:00
smb2pdu.h ksmbd: fix wrong name of SMB2_CREATE_ALLOCATION_SIZE 2024-01-08 11:29:42 +01:00
smb2proto.h smb: client: fix potential OOBs in smb2_parse_contexts() 2024-05-25 16:17:17 +02:00
smb2status.h
…
smb2transport.c
…
smbdirect.c smbdirect: missing rc checks while waiting for rdma events 2023-11-08 11:23:38 +01:00
smbdirect.h
…
smbencrypt.c
…
smberr.h
…
smbfsctl.h
…
trace.c
…
trace.h
…
transport.c cifs: Move the in_send statistic to __smb_send_rqst() 2023-03-22 13:28:03 +01:00
winucase.c
…
xattr.c
…