94b0851aad
The return type of `internal_strlen()` is 'uptr', but in `printf_common()` we store the result of `internal_strlen()` into an 'int' type variable. When the result value of `internal_strlen()` is larger than the largest possible value of 'int' type, the implicit conversion from 'uptr' to 'int' will change the result value to a negative value. Without this change, asan reports a false positive negative-size-param in the added testcase. Reviewed By: vitalybuka Differential Revision: https://reviews.llvm.org/D157266
35 lines
868 B
C++
35 lines
868 B
C++
// Test that the common part implementation of *printf interceptors does not
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// cause negative-size-param false positives.
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// RUN: %clangxx -O2 %s -o %t
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// RUN: %env_tool_opts=check_printf=1 %run %t 2>&1
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// FIXME: The maximum supported allocation size is too platform-specific:
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// REQUIRES: x86_64-target-arch
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// FIXME: printf is not intercepted on Windows yet.
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// UNSUPPORTED: target={{.*windows-msvc.*}}
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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void write(char *buf, int buf_size, const char *fmt, ...) {
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va_list args;
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va_start(args, fmt);
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vsnprintf(buf, buf_size, fmt, args);
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va_end(args);
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}
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int main() {
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char buffer[100];
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const size_t kStrSize = 1UL << 31;
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char *x = (char *)malloc(kStrSize);
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memset(x, '=', kStrSize - 1);
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x[kStrSize - 1] = 0;
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write(buffer, 100, "%s\n", x);
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free(x);
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return 0;
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}
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