bugThe FreeType Project - Bugs: bug #46345, FreeType 2.6.1 TrueType parsing...

 
 

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bug #46345: FreeType 2.6.1 TrueType parsing NULL pointer dereference in "tt_sbit_decoder_load_bit_aligned"

Submitter:  Mateusz Jurczyk <j00ru>
Submitted:  Sat 31 Oct 2015 10:55:34 AM UTC
   
 
Severity:  3 - Normal Item Group:  Crash
Status:  Fixed Privacy:  Public
Assigned to:  wl Open/Closed:  Closed
Planned Release:  2.6.2

Tue 03 Nov 2015 04:31:52 PM UTC, comment #4: 

Fixed in git, thanks.

 Werner LEMBERG <wl>
Group administrator
Mon 02 Nov 2015 10:42:08 AM UTC, comment #3: 

Hmmm... the other one fails to upload for some reason, but I think one should be sufficient.

 Mateusz Jurczyk <j00ru>
Group Member
Mon 02 Nov 2015 10:40:46 AM UTC, comment #2: 

Whoops! Attached two testcases.

(file #35363)

 Mateusz Jurczyk <j00ru>
Group Member
Sat 31 Oct 2015 04:56:56 PM UTC, comment #1: 

No attachment :-)

 Werner LEMBERG <wl>
Group administrator
Sat 31 Oct 2015 10:55:34 AM UTC, original submission:  

The following infinite recursion crash has been encountered in FreeType while fuzzing TrueType fonts. It has been reproduced with the current version of freetype2 from master git branch, with a 64-bit build of the ftbench utility compiled with AddressSanitizer:

$ ftbench <file>

Attached is a POC file which triggers the condition.

---
$ freetype2-demos/bin/ftbench signal_sigsegv_7833bc_1476_93c98e80bf174d0ca3897ef81de1ecc6

ftbench results for font `signal_sigsegv_7833bc_1476_93c98e80bf174d0ca3897ef81de1ecc6'
--------------------------------------------------------------------------------------

family: Osaka-Mono
 style: Regular-M

number of seconds for each test: 2.000000

starting glyph index: 0
face size: 10ppem
font preloading into memory: no

load flags: 0x0
render mode: 0

CFF engine set to Adobe
TrueType engine set to version 35
maximum cache size: 1024KiByte

executing tests:
  Load                      ASAN:DEADLYSIGNAL
=================================================================
==18422==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x00000069a4f9 bp 0x7ffc54cb98f0 sp 0x7ffc54cb9760 T0)
    #0 0x69a4f8 in tt_sbit_decoder_load_bit_aligned freetype2/src/sfnt/ttsbit.c:825:19
    #1 0x699416 in tt_sbit_decoder_load_bitmap freetype2/src/sfnt/ttsbit.c:1127:15
    #2 0x6973f6 in tt_sbit_decoder_load_image freetype2/src/sfnt/ttsbit.c:1315:12
    #3 0x69b0d3 in tt_sbit_decoder_load_compound freetype2/src/sfnt/ttsbit.c:922:15
    #4 0x699416 in tt_sbit_decoder_load_bitmap freetype2/src/sfnt/ttsbit.c:1127:15
    #5 0x6973f6 in tt_sbit_decoder_load_image freetype2/src/sfnt/ttsbit.c:1315:12
    #6 0x68564f in tt_face_load_sbit_image freetype2/src/sfnt/ttsbit.c:1480:19
    #7 0x559825 in load_sbit_image freetype2/src/truetype/ttgload.c:2101:13
    #8 0x5584bc in TT_Load_Glyph freetype2/src/truetype/ttgload.c:2448:15
    #9 0x52c782 in tt_glyph_load freetype2/src/truetype/ttdriver.c:396:13
    #10 0x4ede8e in FT_Load_Glyph freetype2/src/base/ftobjs.c:742:15
    #11 0x4e5c4e in test_load freetype2-demos/src/ftbench.c:250:13
    #12 0x4e621f in benchmark freetype2-demos/src/ftbench.c:216:15
    #13 0x4e46c9 in main freetype2-demos/src/ftbench.c:1058:9

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV freetype2/src/sfnt/ttsbit.c:825:19 in tt_sbit_decoder_load_bit_aligned
==18422==ABORTING
---

 Mateusz Jurczyk <j00ru>
Group Member

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attached Files
file #35363:  signal_sigsegv_7833bc_9078_fbc901829860625e3d156fced50cd1c0 added by j00ru (7KiB - application/octet-stream)

 

Depends on the following items: None found

Items that depend on this one: None found

 

Carbon-Copy List
  • -email is unavailable- added by wl (Posted a comment)
  • -email is unavailable- added by j00ru (Submitted the item)

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    Follow 7 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2015-11-03 wl StatusNeed Info Fixed
        PrivacyPrivate Public
        Open/ClosedOpen Closed
        Planned ReleaseNone 2.6.2
    2015-11-02 j00ru Attached File- Added signal_sigsegv_7833bc_9078_fbc901829860625e3d156fced50cd1c0, #35363
    2015-10-31 wl StatusNone Need Info
        Assigned toNone wl

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