[Tinycc-devel] Segmentation violation in use_section1

[bugs-syssec]

Dear all,

While fuzzing tcc, a segmentation violation was found in the 
use_section1 function.

Attached are a file producing a crash when compiled, the output of the 
clang address sanitizer and valgrind.

There are multiple inputs leading to the same crash,
they are included in the attached file as comments.

To reproduce, compile the attached input file with tcc

    tcc use_section1-oob-write.c

The latest git version of tcc (commit 
c4787e3626904fc542bd640cc368a9d306347008) was tested.


Credits: SysSec chair of Ruhr University Bochum

valgrind.txt
Description: Text document

asan.txt
Description: Text document

use_section1-oob_write.c
Description: Text document