soc/intel/common: Check bios_size and window_size after MIN operation
Clang Static Analyzer version 8.0.0 detects that log2_ceil(bios_size)
and log2_ceil(window_size) are garbage or undefined if the value of
bios_size and window_size is zero. Check bios_size and window_size after
MIN operation to prevent error.
TEST=Built and boot up to kernel.
Change-Id: Ifc3f3da52d129ef5d6063a46b045603a236be759
Signed-off-by: John Zhao <john.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32924
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
diff --git a/src/soc/intel/common/block/fast_spi/fast_spi.c b/src/soc/intel/common/block/fast_spi/fast_spi.c
index 455b13c..58e7db7 100644
--- a/src/soc/intel/common/block/fast_spi/fast_spi.c
+++ b/src/soc/intel/common/block/fast_spi/fast_spi.c
@@ -236,14 +236,13 @@
/* Only the IFD BIOS region is memory mapped (at top of 4G) */
fast_spi_get_bios_region(&bios_size);
- if (!bios_size)
- return;
-
/* LOCAL APIC default address is 0xFEE0000, bios_size over 16MB will
* cause memory type conflict when setting memory type to write
* protection, so limit the cached bios region to be no more than 16MB.
* */
bios_size = MIN(bios_size, 16 * MiB);
+ if (!bios_size)
+ return;
/* Round to power of two */
alignment = 1UL << (log2_ceil(bios_size));
diff --git a/src/soc/intel/common/block/lpc/lpc_lib.c b/src/soc/intel/common/block/lpc/lpc_lib.c
index b383637..c67c435 100644
--- a/src/soc/intel/common/block/lpc/lpc_lib.c
+++ b/src/soc/intel/common/block/lpc/lpc_lib.c
@@ -80,6 +80,9 @@
/* Each IO range register can only open a 256-byte window. */
window_size = MIN(size, LPC_LGIR_MAX_WINDOW_SIZE);
+ if (!window_size)
+ return;
+
/* Window size must be a power of two for the AMASK to work. */
alignment = 1UL << (log2_ceil(window_size));
window_size = ALIGN_UP(window_size, alignment);