Closed
Bug 1295371
Opened 8 years ago
Closed 7 years ago
freetype2: left shift of negative value in [@tt_sbit_decoder_load_bit_aligned]
Categories
(Core :: Graphics: Text, defect)
Core
Graphics: Text
Tracking
()
RESOLVED
FIXED
People
(Reporter: tsmith, Unassigned)
References
(Blocks 1 open bug)
Details
(Keywords: testcase, Whiteboard: [gfx-noted])
Attachments
(1 file)
48.00 KB,
application/x-font-ttf
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Details |
Found while fuzzing freetype2 commit 248f5629d8889aa5b77ea5bfce0935140293d50d (>2.6.5) I'm not sure if this affects the browser or if we are protected by OTS. I'm also not sure how far this bug goes back. src/sfnt/ttsbit.c:867:39: runtime error: left shift of negative value -4081 #0 0x7fe197e03163 in tt_sbit_decoder_load_bit_aligned src/sfnt/ttsbit.c:877:29 #1 0x7fe197dfde04 in tt_sbit_decoder_load_bitmap src/sfnt/ttsbit.c:1162:15 #2 0x7fe197dfde04 in tt_sbit_decoder_load_image src/sfnt/ttsbit.c:1357 #3 0x7fe197e0392b in tt_sbit_decoder_load_compound src/sfnt/ttsbit.c:949:15 #4 0x7fe197dfde04 in tt_sbit_decoder_load_bitmap src/sfnt/ttsbit.c:1162:15 #5 0x7fe197dfde04 in tt_sbit_decoder_load_image src/sfnt/ttsbit.c:1357 #6 0x7fe197dec52a in tt_face_load_sbit_image src/sfnt/ttsbit.c:1523:19 #7 0x7fe197bd08e4 in load_sbit_image src/truetype/ttgload.c:2189:13 #8 0x7fe197bd08e4 in TT_Load_Glyph src/truetype/ttgload.c:2608 #9 0x7fe197bd08e4 in tt_glyph_load src/truetype/ttdriver.c:424 #10 0x7fe197b2233e in FT_Load_Glyph src/base/ftobjs.c:742:15 #11 0x4ea5aa in TestFace src/tools/ftrandom/../../../src/tools/ftrandom/ftrandom.c:105:12 #12 0x4ea5aa in ExecuteTest src/tools/ftrandom/../../../src/tools/ftrandom/ftrandom.c:143 #13 0x4ea5aa in main src/tools/ftrandom/../../../src/tools/ftrandom/ftrandom.c:166 #14 0x7fe196be982f in __libc_start_main /build/glibc-GKVZIf/glibc-2.23/csu/../csu/libc-start.c:291 #15 0x418a78 in _start (/home/user/workspace/freetype2/ftrandom+0x418a78)
Updated•8 years ago
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Whiteboard: [gfx-noted]
Comment 1•8 years ago
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Sorry, can't repeat. Please provide the failing `test_case.ttf` instance.
Flags: needinfo?(twsmith)
Reporter | ||
Comment 2•8 years ago
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I can repro with the attached test_case.ttf with the latest revision from git. FWIW I am using the same ftrandom.c file as bug 1272173. I am using the using the following build args: CC=clang CFLAGS="-fsanitize=undefined -fno-sanitize-recover=undefined -g -O2" LDFLAGS=-fsanitize=undefined I hope this helps, if not I can try finding a different test case.
Flags: needinfo?(twsmith)
Reporter | ||
Comment 3•8 years ago
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Logged as: https://savannah.nongnu.org/bugs/?48980
Reporter | ||
Comment 4•7 years ago
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Fixed in FreeType 2.7
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Description
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