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Fix crash in best_group() (#1891)

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This pull request fixes a rare crashing bug on Windows inside our NUMA code, first
reported by Dann Corbit in the following forum thread (thanks!):
https://groups.google.com/forum/?fromgroups=#!topic/fishcooking/gA6aoMEuOwg

The fix is to not use structure member beyond known size when iterating through
'SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX' structure. We note that the Microsoft
API is guaranteed to provide us at least one element upon successful, and no
element in the structure can have a zero size.

No functional change.
This commit is contained in:
noobpwnftw 2018-12-23 01:05:13 +08:00 • committed by Stéphane Nicolet
parent ade87ff8d3
commit 0194da0d80
1 changed files with 2 additions and 1 deletions
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3
src/misc.cpp
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@ -257,7 +257,7 @@ int best_group(size_t idx) {
return -1;
}
while (ptr->Size > 0 && byteOffset + ptr->Size <= returnLength)
while (byteOffset < returnLength)
{
if (ptr->Relationship == RelationNumaNode)
nodes++;
@ -268,6 +268,7 @@ int best_group(size_t idx) {
threads += (ptr->Processor.Flags == LTP_PC_SMT) ? 2 : 1;
}
assert(ptr->Size);
byteOffset += ptr->Size;
ptr = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX*)(((char*)ptr) + ptr->Size);
}