Kernel panic at fput() function of unsigned kernel module mfeaack

Solution Unverified - Updated -

Issue

  • The system crashed with the following call traces in the kernel ring buffer :
BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
IP: [<ffffffff811a2e41>] __fput+0x21/0x220
Kernel PGD 8000000111f10067 PUD 1389e8067 PMD 0 
User   PGD 111f10067 PUD 1389e8067 PMD 0 
Oops: 0000 [#1] SMP 
[..]
Call Trace:
 [<ffffffff811a3065>] fput+0x25/0x30
 [<ffffffffa03c8bf3>] get_process_from_pid+0xf3/0x1c0 [mfeaack]
 [<ffffffffa03c91fc>] create_eventinfo_struct+0x48c/0x540 [mfeaack]
 [<ffffffffa03c94cd>] process_aac_pre_events+0xad/0x1f0 [mfeaack]
 [<ffffffffa03b7fbf>] process_kill_sig+0x9f/0x110 [mfeaack]
 [<ffffffffa03b8173>] custom_sys_kill+0x33/0x80 [mfeaack]
 [<ffffffff81564357>] system_call_fastpath+0x35/0x3a
Code: ee ff c9 c3 66 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 18 0f 1f 44 00 00 48 8b 47 18 48 89 fb 48 89 45 c8 <48> 8b 50 10 4c 8b 7f 10 48 89 55 c0 e8 7e 66 3b 00 4c 8b 73 18 
RIP  [<ffffffff811a2e41>] __fput+0x21/0x220
 RSP <ffff88001fc17d68>
CR2: 0000000000000010

Environment

  • Red Hat Enterprise Linux 6

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