Commit 83520d62 authored by dean.yang_cp's avatar dean.yang_cp Committed by Vineet Gupta
Browse files

ARC: treewide: avoid the pointer addition with NULL pointer 



Signed-off-by: default avatardean.yang_cp <yangdianqing@yulong.com>
Acked-by: default avatarVineet Gupta <vgupta@synopsys.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 46e15218

arch/arc/kernel/unwind.c

+14 −13
Original line number Diff line number Diff line
@@ -187,25 +187,26 @@ static void init_unwind_table(struct unwind_table *table, const char *name, 
			      const void *table_start, unsigned long table_size,

			      const u8 *header_start, unsigned long header_size)

{

	const u8 *ptr = header_start + 4;

	const u8 *end = header_start + header_size;



	table->core.pc = (unsigned long)core_start;

	table->core.range = core_size;

	table->init.pc = (unsigned long)init_start;

	table->init.range = init_size;

	table->address = table_start;

	table->size = table_size;



	/* To avoid the pointer addition with NULL pointer.*/

	if (header_start != NULL) {

		const u8 *ptr = header_start + 4;

		const u8 *end = header_start + header_size;

		/* See if the linker provided table looks valid. */

		if (header_size <= 4

		|| header_start[0] != 1

	    || (void *)read_pointer(&ptr, end, header_start[1]) != table_start

		|| (void *)read_pointer(&ptr, end, header_start[1])

				!= table_start

		|| header_start[2] == DW_EH_PE_omit

		|| read_pointer(&ptr, end, header_start[2]) <= 0

		|| header_start[3] == DW_EH_PE_omit)

			header_start = NULL;



	}

	table->hdrsz = header_size;

	smp_wmb();

	table->header = header_start;