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PM / sleep: declare __tracedata symbols as char[] rather than char
Accessing more than one byte from a symbol declared simply 'char' is undefined behavior, as reported by UBSAN: UBSAN: Undefined behaviour in drivers/base/power/trace.c:178:18 load of address ffffffff8203fc78 with insufficient space for an object of type 'char' Avoid this by declaring the symbols as arrays. Signed-off-by: Eric Biggers <ebiggers3@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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1 changed files with 2 additions and 2 deletions
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@ -166,14 +166,14 @@ void generate_pm_trace(const void *tracedata, unsigned int user)
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}
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EXPORT_SYMBOL(generate_pm_trace);
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extern char __tracedata_start, __tracedata_end;
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extern char __tracedata_start[], __tracedata_end[];
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static int show_file_hash(unsigned int value)
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{
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int match;
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char *tracedata;
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match = 0;
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for (tracedata = &__tracedata_start ; tracedata < &__tracedata_end ;
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for (tracedata = __tracedata_start ; tracedata < __tracedata_end ;
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tracedata += 2 + sizeof(unsigned long)) {
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unsigned short lineno = *(unsigned short *)tracedata;
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const char *file = *(const char **)(tracedata + 2);
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