ARM: zImage: don't ignore error returned from decompress()

If decompress() returns an error without calling error(), we must
not attempt to boot the resulting kernel.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/compressed/decompress.c

@@ -44,7 +44,7 @@ extern void error(char *);
 #include "../../../../lib/decompress_unlzma.c"
 #endif
 
-void do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
+int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
 {
-	decompress(input, len, NULL, NULL, output, NULL, error);
+	return decompress(input, len, NULL, NULL, output, NULL, error);
 }

arch/arm/boot/compressed/misc.c

@@ -177,14 +177,16 @@ asmlinkage void __div0(void)
 	error("Attempting division by 0!");
 }
 
-extern void do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));
+extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));
 
 
 void
 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
 		unsigned long free_mem_ptr_end_p,
 		int arch_id)
 {
+	int ret;
+
 	output_data		= (unsigned char *)output_start;
 	free_mem_ptr		= free_mem_ptr_p;
 	free_mem_end_ptr	= free_mem_ptr_end_p;
@@ -193,7 +195,10 @@ decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
 	arch_decomp_setup();
 
 	putstr("Uncompressing Linux...");
-	do_decompress(input_data, input_data_end - input_data,
-			output_data, error);
-	putstr(" done, booting the kernel.\n");
+	ret = do_decompress(input_data, input_data_end - input_data,
+			    output_data, error);
+	if (ret)
+		error("decompressor returned an error");
+	else
+		putstr(" done, booting the kernel.\n");
 }