lzma: update to version 24.09 #76
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New versions of LZMA are distributed as 7z archives here: If someones wants to investigate the C++ library, it can be found in the |
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crnlib/lzma/Ppmd7Enc.c: R->Low += start * R->Range; Multiplication result may overflow 'unsigned int' before it is converted to 'unsigned long'.
crnlib/lzma/Bcj2Enc.c: In function ‘Bcj2Enc_Encode’:
crnlib/lzma/Bcj2Enc.c:488:20: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
488 | p->temp[i] = src[i];
| ~~~~~~~~~~~^~~~~~~~
In file included from crnlib/lzma/Bcj2Enc.c:14:
crnlib/lzma/Bcj2.h:287:8: note: at offset 8 into destination object ‘temp’ of size 8
287 | Byte temp[8];
| ^
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slipher
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Mar 19, 2025
| @@ -486,7 +486,7 @@ void Bcj2Enc_Encode(CBcj2Enc *p) | |||
| // (0 < p->tempPos <= 4) | |||
| do | |||
| p->temp[i] = src[i]; | |||
| while (++i != rem); | |||
| while (++i != rem + 1); | |||
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This doesn't any make any sense. How would you fix a buffer overflow by making it copy MORE data?
I suggest not making any local edits to 3rd-party libraries unless it is truly necessary.
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That's an old branch sitting on my computer, updating the very old LZMA shipped with crunch with the last one from upstream.
What annoys me is that Crunch is a C++ library but it shipped with the C LZMA library, adding custom wrapping code to make it compilable with a C++ compiler. I don't want to have to replay such change on every LZMA update, so I included it as a C library, meaning I had to make Crunch not only a C++ project but a C++ & C project, meaning selecting a different compiler requires to select both the C++ and C compiler…
An alternative would be to move to the C++ LZMA library but then that requires to port the code to the C++ LZMA API I guess… and I'm lazy. All I want is to make sure we use latest versions of libraries and don't sit on very old dependencies with potential unfixed decades-old issues.