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lzmainfo: Avoid integer overflow

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The MB output can overflow with huge numbers. Most likely these are
invalid .lzma files anyway, but let's avoid garbage output.

lzmadec was adapted from LZMA Utils. The original code with this bug
was written in 2005, over 19 years ago.

Co-authored-by: Lasse Collin <lasse.collin@tukaani.org>
Closes: https://github.com/tukaani-project/xz/pull/144
(cherry picked from commit 76cfd0a9bb33ae8e534b1f73f6359dc825589f2f)
This commit is contained in:
Tobias Stoeckmann 2024-09-16 23:19:46 +02:00 committed by Lasse Collin
parent 40a7f163f5
commit aef9a25b32
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GPG Key ID: 38EE757D69184620
1 changed files with 2 additions and 3 deletions
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5
src/lzmainfo/lzmainfo.c
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@ -149,8 +149,7 @@ lzmainfo(const char *name, FILE *f)
printf("Unknown");
else
printf("%" PRIu64 " MB (%" PRIu64 " bytes)",
(uncompressed_size + 512 * 1024)
/ (1024 * 1024),
(uncompressed_size / 1024 + 512) / 1024,
uncompressed_size);
lzma_options_lzma *opt = filter.options;
@ -160,7 +159,7 @@ lzmainfo(const char *name, FILE *f)
"Literal context bits (lc): %" PRIu32 "\n"
"Literal pos bits (lp): %" PRIu32 "\n"
"Number of pos bits (pb): %" PRIu32 "\n",
(opt->dict_size + 512 * 1024) / (1024 * 1024),
(opt->dict_size / 1024 + 512) / 1024,
my_log2(opt->dict_size), opt->lc, opt->lp, opt->pb);
free(opt);