maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Bugfix for collecting features from very small DSOs. 

During unit tests, it was observed that crafting an artificially small DSO could cause OOB memory to be accessed. This change fixes that (but again, the affected DSOs are unlikely to ever occur outside unit tests).

Reviewed By: morehouse, charco

Differential Revision: https://reviews.llvm.org/D94507
This commit is contained in:
Aaron Green 2021-02-17 13:00:44 -08:00 committed by Marco Vanotti
parent 3c4c205060
commit 10993bf072
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
compiler-rt/lib/fuzzer/FuzzerTracePC.h
View File

@ -193,7 +193,7 @@ size_t ForEachNonZeroByte(const uint8_t *Begin, const uint8_t *End,
Handle8bitCounter(FirstFeature, P - Begin, V);
// Iterate by Step bytes at a time.
for (; P < End; P += Step)
for (; P + Step <= End; P += Step)
if (LargeType Bundle = *reinterpret_cast<const LargeType *>(P)) {
Bundle = HostToLE(Bundle);
for (size_t I = 0; I < Step; I++, Bundle >>= 8)