[compiler-rt] [lsan] Fix free(NULL) interception during initialization (PR #106912)

[via llvm-commits]

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@@ -77,6 +77,8 @@ INTERCEPTOR(void*, malloc, uptr size) {
 }
 
 INTERCEPTOR(void, free, void *p) {
+  if (!p)
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tmiasko wrote:

I updated the patch to include UNLIKELY in the condition.

For lsan cfree interceptor is aliased to free and doesn't need further changes.

I looked a little bit more at other sanitizers and I don't think they actually need any further changes. For those that don't immediately return for null, it is fine if execution just falls through to the main deallocation function, since null case is handled early on there.

https://github.com/llvm/llvm-project/pull/106912