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| author | Martin Liska <mliska@suse.cz> | 2021-02-23 11:14:03 +0100 |
|---|---|---|
| committer | Martin Liska <mliska@suse.cz> | 2021-02-23 11:15:16 +0100 |
| commit | e03e58c1844d04678f95b278f3eff2a5fbaeff75 (patch) | |
| tree | a9eb4582e40be970e6f5bbcd30191cc558244d65 /libsanitizer | |
| parent | 74af13c174714dd3b9f1ded4b39955f003c16361 (diff) | |
| download | gcc-e03e58c1844d04678f95b278f3eff2a5fbaeff75.tar.gz | |
Fix UBSAN in __ubsan::Value::getSIntValue
/home/marxin/Programming/gcc2/libsanitizer/ubsan/ubsan_value.cpp:77:25: runtime error: left shift of 0x0000000000000000fffffffffffffffb by 96 places cannot be represented in type '__int128'
#0 0x7ffff754edfe in __ubsan::Value::getSIntValue() const /home/marxin/Programming/gcc2/libsanitizer/ubsan/ubsan_value.cpp:77
#1 0x7ffff7548719 in __ubsan::Value::isNegative() const /home/marxin/Programming/gcc2/libsanitizer/ubsan/ubsan_value.h:190
#2 0x7ffff7542a34 in handleShiftOutOfBoundsImpl /home/marxin/Programming/gcc2/libsanitizer/ubsan/ubsan_handlers.cpp:338
#3 0x7ffff75431b7 in __ubsan_handle_shift_out_of_bounds /home/marxin/Programming/gcc2/libsanitizer/ubsan/ubsan_handlers.cpp:370
#4 0x40067f in main (/home/marxin/Programming/testcases/a.out+0x40067f)
#5 0x7ffff72c8b24 in __libc_start_main (/lib64/libc.so.6+0x27b24)
#6 0x4005bd in _start (/home/marxin/Programming/testcases/a.out+0x4005bd)
Differential Revision: https://reviews.llvm.org/D97263
Cherry-pick from 16ede0956cb1f4b692dfa619ccfa6ab1de28e19b.
Diffstat (limited to 'libsanitizer')
| -rw-r--r-- | libsanitizer/ubsan/ubsan_value.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libsanitizer/ubsan/ubsan_value.cpp b/libsanitizer/ubsan/ubsan_value.cpp index 79c3ba991d3..40042bf3a90 100644 --- a/libsanitizer/ubsan/ubsan_value.cpp +++ b/libsanitizer/ubsan/ubsan_value.cpp @@ -74,7 +74,7 @@ SIntMax Value::getSIntValue() const { // to SIntMax. const unsigned ExtraBits = sizeof(SIntMax) * 8 - getType().getIntegerBitWidth(); - return SIntMax(Val) << ExtraBits >> ExtraBits; + return SIntMax(UIntMax(Val) << ExtraBits) >> ExtraBits; } if (getType().getIntegerBitWidth() == 64) return *reinterpret_cast<s64*>(Val); |