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xzlib: Fix harmless unsigned integer overflow

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This commit is contained in:
Nick Wellnhofer
2023-12-19 19:47:07 +01:00
parent 1ef3566362
commit e62b0dbde5
1 changed files with 5 additions and 1 deletions
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6
xzlib.c
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@@ -321,8 +321,12 @@ is_format_lzma(xz_statep state)
* If someone complains, this will be reconsidered. * If someone complains, this will be reconsidered.
*/ */
if (dict_size != UINT32_MAX) { if (dict_size != UINT32_MAX) {
uint32_t d = dict_size - 1; uint32_t d;
if (dict_size == 0)
return 0;
d = dict_size - 1;
d |= d >> 2; d |= d >> 2;
d |= d >> 3; d |= d >> 3;
d |= d >> 4; d |= d >> 4;