Fixed some potential integer overflows in coreclr#124047
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jkotas merged 15 commits intodotnet:mainfrom Feb 17, 2026
Merged
Fixed some potential integer overflows in coreclr#124047jkotas merged 15 commits intodotnet:mainfrom
jkotas merged 15 commits intodotnet:mainfrom
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In the MCList::processArgAsMCL function, an input string consisting of digits and the characters ',' and '-' is parsed into a set of numbers and/or ranges of numbers. If the string contains a number greater than UINT_MAX, the scratch variable will overflow. The input string often comes from command-line arguments, so protection is necessary.
The result of the multiplication will be of type uint32_t, since the highest operand type is uint32_t, so overflow will occur if num_heaps > 255. To promote the result to size_t, you must explicitly convert at least one of the operands to size_t.
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Tagging subscribers to this area: @agocke, @dotnet/gc |
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Hi @agocke @dotnet/gc. Could you please take a look when you have a moment and let me know if this is ready to merge or if you’d like changes? Thanks! |
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Fixed some potential integer overflows in gc.cpp and mclist.cpp. The errors were discovered using the Svace static analyzer. I didn't observe any in practice.
In
gc_heap::joined_youngest_desiredthe result of the multiplication will be of typeuint32_t, since the highest operand type isuint32_t, so overflow will occur ifnum_heaps > 255. To promote the result tosize_t, you must explicitly convert at least one of the operands tosize_t.In the
MCList::processArgAsMCL, an input string consisting of digits and the characters ',' and '-' is parsed into a set of numbers and/or ranges of numbers. If the string contains a number greater thanUINT_MAX, thescratchwill overflow. Theinputstring often comes from command-line arguments, so protection is necessary.Found by Linux Verification Center (linuxtesting.org) with SVACE.
Reporter: Pavel Tikhomirov (Tihomirov-P@gaz-is.ru).
Organization: Gazinformservice (resp@gaz-is.ru).