Fix heap overflow detected by a clang sanitizer #6435
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Context: dotnet#6420 (comment) Clang's AddressSanitizer detected the following: 10-26 15:55:25.393 2488 2488 I Mono.Android_Tests: ==2488==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x8a600774 at pc 0xaeee9982 bp 0xbf98dc68 sp 0xbf98dc60 10-26 15:55:25.394 2488 2488 I Mono.Android_Tests: WRITE of size 4 at 0x8a600774 thread T0 10-26 15:55:25.398 2488 2488 I Mono.Android_Tests: #0 0xaeee9981 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x38981) 10-26 15:55:25.398 2488 2488 I Mono.Android_Tests: #1 0xaeef92d9 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x482d9) 10-26 15:55:25.398 2488 2488 I Mono.Android_Tests: #2 0xaef009ae (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x4f9ae) 10-26 15:55:25.398 2488 2488 I Mono.Android_Tests: #3 0xaef06d14 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x55d14) 10-26 15:55:25.399 2488 2488 I Mono.Android_Tests: 0x8a600774 is located 0 bytes to the right of 4-byte region [0x8a600770,0x8a600774) 10-26 15:55:25.399 2488 2488 I Mono.Android_Tests: allocated by thread T0 here: 10-26 15:55:25.399 2488 2488 I Mono.Android_Tests: #0 0xaedbe925 (/data/app/Mono.Android_Tests-1/lib/x86/libclang_rt.asan-i686-android.so+0xb6925) 10-26 15:55:25.399 2488 2488 I Mono.Android_Tests: #1 0xaeee9ae1 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x38ae1) 10-26 15:55:25.399 2488 2488 I Mono.Android_Tests: #2 0xaeee9751 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x38751) 10-26 15:55:25.399 2488 2488 I Mono.Android_Tests: #3 0xaeef92d9 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x482d9) 10-26 15:55:25.399 2488 2488 I Mono.Android_Tests: dotnet#4 0xaef009ae (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x4f9ae) 10-26 15:55:25.400 2488 2488 I Mono.Android_Tests: dotnet#5 0xaef06d14 (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x55d14) 10-26 15:55:25.400 2488 2488 I Mono.Android_Tests: dotnet#6 0xb30cb970 (/data/dalvik-cache/x86/data@app@Mono.Android_Tests-1@base.apk@classes.dex+0x5c970) 10-26 15:55:25.400 2488 2488 I Mono.Android_Tests: SUMMARY: AddressSanitizer: heap-buffer-overflow (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x38981) Address of the offending region points to `BasicUtilities::monodroid_strsplit` and is likely the line modified in this commit. Append terminating `nullptr` to vector instead of overwriting the last element.
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Context: #6420 (comment)
Clang's AddressSanitizer detected the following:
Address of the offending region points to
BasicUtilities::monodroid_strsplitand is likely the line modified inthis commit. Append terminating
nullptrto vector instead ofoverwriting the last element.