[Bug 452] New: Null pointer dereference in find_inode_fast

[Martin J. Bligh]

http://bugme.osdl.org/show_bug.cgi?id=452

           Summary: Null pointer dereference in iget_locked
    Kernel Version: 2.5.64
            Status: NEW
          Severity: normal
             Owner: [e-mail]
         Submitter: [e-mail]

Distribution: heavily modified RedHat 7.2
Hardware Environment: Athlon Thunderbird 1.0GHz, (2) WD1600JB
Software Environment: 2.5.64 kernel, LVM2 on top of MD RAID-1
Problem Description: Null pointer dereference in iget_locked

Mar  8 08:09:18 jeeves kernel: Unable to handle kernel NULL pointer dereference
at virtual address 00000000
 printing eip:
c0152ddc
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0060:[<c0152ddc>]    Not tainted
EFLAGS: 00010286
EIP is at find_inode_fast+0x1c/0x40
eax: 00000000   ebx: 00cb55d8   ecx: 00000000   edx: c53616a0
esi: cfd21000   edi: 00cb55d8   ebp: cfd21000   esp: c6cdbd88
ds: 007b   es: 007b   ss: 0068
Process make (pid: 11518, threadinfo=c6cda000 task=c3892680)
Stack: 00000000 c12a98b4 c0153209 cfd21000 c12a98b4 00cb55d8 00cb55d8 00000000 
       c17b4af8 00000000 00000000 00000000 00000000 00000000 00000000 c17b4af8 
       00cb55d8 00000000 c01ac7c4 cfd21000 00cb55d8 00000000 00000000 00000000 
Call Trace:
 [<c0153209>] iget_locked+0x39/0x80
 [<c01ac7c4>] xfs_iget+0x34/0x120
 [<c01c16b6>] xfs_dir_lookup_int+0x56/0xc0
 [<c01c52cd>] xfs_lookup+0x3d/0x70
 [<c01cf18f>] linvfs_lookup+0x3f/0x80
 [<c014988d>] real_lookup+0x4d/0xc0
 [<c0149ada>] do_lookup+0x4a/0x90
 [<c01cf5a0>] linvfs_permission+0x0/0x20
 [<c014a00e>] link_path_walk+0x4ee/0x7b0
 [<c01cc0bd>] linvfs_readdir+0x1bd/0x1d0
 [<c01495dd>] getname+0x5d/0xa0
 [<c014a664>] __user_walk+0x24/0x40
 [<c0146617>] vfs_stat+0x17/0x50
 [<c0146bc0>] sys_stat64+0x10/0x30
 [<c0130000>] s_show+0x150/0x1c0
 [<c010a5b3>] syscall_call+0x7/0xb