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Null pointer dereference vulnerability in ifilter_bank (libfaad/filtbank.c:275) #26

fantasy7082 opened this Issue Dec 17, 2018 · 0 comments


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fantasy7082 commented Dec 17, 2018

Hi, i found a null pointer dereference bug in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.8. It crashed in function ifilter_bank.the details are below(ASAN):

./faad faad_res/008-null-point-filtbank_275 -o out.wav
 *********** Ahead Software MPEG-4 AAC Decoder V2.8.8 ******************

 Build: Dec 13 2018
 Copyright 2002-2004: Ahead Software AG
 bug tracking:
 Floating point version

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License.


faad_res/008-null-point-filtbank_275 file info:
ADTS, 0.043 sec, 74 kbps, 48000 Hz

 | Config:  2 Ch       |
 | Ch |    Position    |
 | 00 | Left front     |
 | 01 | Right front    |

ASAN:SIGSEGV faad_res/008-null-point-filtbank_275.
==7076==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7f5946ec66b1 bp 0x7fff7f757780 sp 0x7fff7f755690 T0)
    #0 0x7f5946ec66b0 in ifilter_bank /root/faad2_asan/libfaad/filtbank.c:275
    #1 0x7f5946f0119d in reconstruct_channel_pair /root/faad2_asan/libfaad/specrec.c:1258
    #2 0x7f5946f07823 in channel_pair_element /root/faad2_asan/libfaad/syntax.c:759
    #3 0x7f5946f05cbf in decode_cpe /root/faad2_asan/libfaad/syntax.c:402
    #4 0x7f5946f06398 in raw_data_block /root/faad2_asan/libfaad/syntax.c:448
    #5 0x7f5946ec09c3 in aac_frame_decode /root/faad2_asan/libfaad/decoder.c:990
    #6 0x7f5946ec0566 in NeAACDecDecode /root/faad2_asan/libfaad/decoder.c:821
    #7 0x40f8ae in decodeAACfile /root/faad2_asan/frontend/main.c:679
    #8 0x411dd4 in faad_main /root/faad2_asan/frontend/main.c:1323
    #9 0x411fe5 in main /root/faad2_asan/frontend/main.c:1366
    #10 0x7f5946af882f in __libc_start_main (/lib/x86_64-linux-gnu/
    #11 0x401aa8 in _start (/usr/local/faad-asan/bin/faad+0x401aa8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /root/faad2_asan/libfaad/filtbank.c:275 ifilter_bank


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