Hwasan reporting check for dladdr failing
In GetGlobalSizeFromDescriptor we use dladdr to get info on the the
current address. dladdr returns 0 if it failed.
During testing on Linux this returned 0 to indicate failure, and
populated the info structure with a NULL pointer which was
This patch checks for dladdr returning 0, and in that case returns 0
from GetGlobalSizeFromDescriptor to indicate failure of identifying
This occurs when GetModuleNameAndOffsetForPC succeeds for some address
not in a dynamically loaded library. One example is when the found
"module" is '[stack]' having come from parsing /proc/self/maps.
Differential Revision: https://reviews.llvm.org/D91344