Fix undefined in core-test and printf-test #1345
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vitaut
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Oct 7, 2019
include/fmt/core.h
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| @@ -1208,6 +1208,7 @@ template <typename Context> class basic_format_args { | |||
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| format_arg do_get(int index) const { | |||
| format_arg arg; | |||
| if (index < 0) return arg; | |||
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This should be fixed in fmt's printf implementation. It shouldn't be calling do_get with negative index.
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OK. I have also split the PR into 3 commits.
Fixes "reference binding to null pointer" in BufferTest.Ctor buffer.operator[] attempts to return a reference to `buffer.ptr_[0]` when `ptr_` in `mock_buffer<int> buffer` is null.
Fixes "signed integer overflow" in PrintfTest.Length
This occurs in `TestLength<long long>("ll")`, since its minimum value minus one
does not fit in long long.
Printf counts arguments from 1. Fixes "shift exponent -4 is negative" in PrintfTest.InvalidArgIndex. `do_get` is called with index -1 when `basic_printf_context.arg` is called with id 4294967295 when basic_printf_context::get_arg subtracts 1 from arg_index 0 in the format string "%0$d".
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Thanks! |
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The change in include/fmt/core.h fixes "shift exponent -4 is negative" in
PrintfTest.InvalidArgIndex
do_getis called with index -1 whenbasic_printf_context.argis calledwith id 4294967295 when basic_printf_context::get_arg subtracts 1 from
arg_index 0 in the format string "%0$d".
The change in test/core-test.cc fixes "reference binding to null pointer" in
BufferTest.Ctor
buffer.operator[] attempts to return a reference to
buffer.ptr_[0]whenptr_inmock_buffer<int> bufferis null.The change in test/printf-test.cc fixes "signed integer overflow" in
PrintfTest.Length
This occurs in
TestLength<long long>("ll"), since its minimum value minusone does not fit in long long.
This fixes all UBSAN reports except one in format-test (#1344).
I agree that my contributions are licensed under the {fmt} license, and agree to future changes to the licensing.