4.4-stable review patch. If anyone has any objections, please let me know.
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From: Eric Biggers ebiggers3@gmail.com
commit f97238373b8662a6d580e204df2e7bcbfa43e27a upstream.
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 Signed-off-by: Jiri Slaby jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/base/power/trace.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/base/power/trace.c +++ b/drivers/base/power/trace.c @@ -166,14 +166,14 @@ void generate_pm_trace(const void *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) { int match; char *tracedata;
match = 0; - for (tracedata = &__tracedata_start ; tracedata < &__tracedata_end ; + for (tracedata = __tracedata_start ; tracedata < __tracedata_end ; tracedata += 2 + sizeof(unsigned long)) { unsigned short lineno = *(unsigned short *)tracedata; const char *file = *(const char **)(tracedata + 2);