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Author SHA1 Message Date
Sim Sun a7a194beb4 Fix dangling pointer issue in LocalUpdatbleMaps 
Libunwindstack would remove duplicated items and update the `prev_map`
during reparsing `/proc/self/maps`. But we leave `prev_real_map`
pointing toward a MapInfo that will be deleted soon. It will cause a
dangling pointer issue.

Add new tests to cover this dangling pointer issue.

Bug: 155511785

Test: libunwindstack_test
Change-Id: I62e1b97bcb73f07e9349671f0b758f5ec9de16c0
 2020-05-01 22:20:01 +00:00
David Srbecky f1932fd107 Fix LocalUpdatableMaps 
Avoid accessing nullptr of already deleted entry.

Add new unit tests that pass with the fix and fail without.

Test: fixes unwinding in ART gcstress tests
Test: All unit tests pass.
Change-Id: Ideb00e2adc899904dd6aeb5dad3fb6fad150322d
 2019-09-16 18:28:38 -07:00