[NonFetal Error]: use-of-uninitialized-value in bison(version 3.8.2.45, commit 25b3d0e1) #94
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Description
Crash Inputs
Here are the files that trigger the bug - muscle-tab.c_186_3-in-muscle_grow.zip
Bug Description
I apply MSan (Memory Sanitizer) to check for errors and report the detected errors as follows.
MemorySanitizer: use-of-uninitialized-value
#0 0x54f335 in muscle_grow /data/code/bison/src/muscle-tab.c:186:3
#1 0x54e4c4 in muscle_syncline_grow /data/code/bison/src/muscle-tab.c:214:3
#2 0x54c815 in muscle_code_grow /data/code/bison/src/muscle-tab.c:227:3
#3 0x5c4783 in gram_parse /data/code/bison/src/parse-gram.c:2082:7
#4 0x6074a5 in reader /data/code/bison/src/reader.c:766:3
#5 0x54a754 in main /data/code/bison/src/main.c:118:3
#6 0x7f62fc25a082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
#7 0x41d70d in _start (/data/program/bison/orig-msan/bin/bison+0x41d70d)
SUMMARY: MemorySanitizer: use-of-uninitialized-value /data/code/bison/src/muscle-tab.c:186:3 in muscle_grow
How to Reproduce
The aforementioned bug can be stably reproduced in version 3.8.2.45 (commit id 25b3d0e).
- Download the bison source code with the official link.
- Using clang/clang++ (10.0.0-4ubuntu1), build bison with MSan.
-U_FORTIFY_SOURCE -fsanitize=memory -g
- Execute bison with the provided input files.
- eg:
/data/program/bison/orig-msan/bin/bison <input-file-path>
- eg:
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