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Commit ee22384c authored by Steven Moreland's avatar Steven Moreland
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libutils: check vsnprintf error 

For encoding errors, this function will return a negative value which
causes problems down the line. Check for an error and return. Also,
integer overflows are guarded.

Bug: 161894517
Test: fuzzer test case
Change-Id: Ia85067d4258bde4b875c832d6223db5dd26b8838
Merged-In: Ia85067d4258bde4b875c832d6223db5dd26b8838
parent 4048e499
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