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Date: Mon, 1 May 2017 11:26:02 +0000
From: "Agostino Sarubbo" <>
To: "" <>
Subject: libsndfile: invalid memory read in flac_buffer_copy (flac.c)

libsndfile is a C library for reading and writing files containing sampled sound.

The complete ASan output of the issue:

# sndfile-resample -to 24000 -c 1 $FILE out
==19624==ERROR: AddressSanitizer: SEGV on unknown address 0x000000004000 (pc 0x7fe14fe3f2b3 bp 0x000000004000 sp 0x7ffcb49c4d50 T0)    
==19624==The signal is caused by a READ memory access. 
    #0 0x7fe14fe3f2b2 in flac_buffer_copy /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/flac.c:287    
    #1 0x7fe14fe403d7 in flac_read_loop /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/flac.c:928 
    #2 0x7fe14fe404d4 in flac_read_flac2f /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/flac.c:999    
    #3 0x7fe14fe34925 in sf_readf_float /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/sndfile.c:1945  
    #4 0x50a525 in sample_rate_convert /tmp/portage/media-libs/libsamplerate-0.1.9/work/libsamplerate-0.1.9/examples/sndfile-resample.c:206:29   
    #5 0x50a525 in main /tmp/portage/media-libs/libsamplerate-0.1.9/work/libsamplerate-0.1.9/examples/sndfile-resample.c:156 
    #6 0x7fe14ef70680 in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289   
    #7 0x419fa8 in _init (/usr/bin/sndfile-resample+0x419fa8)    

AddressSanitizer can not provide additional info. 
SUMMARY: AddressSanitizer: SEGV /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/flac.c:287 in flac_buffer_copy    

Affected version:

Fixed version:

Commit fix:

This bug was discovered by Agostino Sarubbo of Gentoo.



2017-04-12: bug discovered and reported to upstream
2017-04-14: upstream released a patch
2017-04-29: blog post about the issue
2017-04-30: CVE assigned

This bug was found with American Fuzzy Lop.


Agostino Sarubbo
Gentoo Linux Developer

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