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PM / sleep: declare __tracedata symbols as char[] rather than char

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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>
This commit is contained in:
Eric Biggers 2016-01-24 20:08:52 -06:00 committed by Rafael J. Wysocki
parent 388f7b1d6e
commit f97238373b
1 changed files with 2 additions and 2 deletions
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4
drivers/base/power/trace.c
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@ -166,14 +166,14 @@ void generate_pm_trace(const void *tracedata, unsigned int user)
} }
EXPORT_SYMBOL(generate_pm_trace); EXPORT_SYMBOL(generate_pm_trace);
extern char __tracedata_start, __tracedata_end; extern char __tracedata_start[], __tracedata_end[];
static int show_file_hash(unsigned int value) static int show_file_hash(unsigned int value)
{ {
int match; int match;
char *tracedata; char *tracedata;
match = 0; match = 0;
for (tracedata = &__tracedata_start ; tracedata < &__tracedata_end ; for (tracedata = __tracedata_start ; tracedata < __tracedata_end ;
tracedata += 2 + sizeof(unsigned long)) { tracedata += 2 + sizeof(unsigned long)) {
unsigned short lineno = *(unsigned short *)tracedata; unsigned short lineno = *(unsigned short *)tracedata;
const char *file = *(const char **)(tracedata + 2); const char *file = *(const char **)(tracedata + 2);