[coreboot-gerrit] Change in ...coreboot[master]: mb/sifive/hifive-unleashed: Check for errors in fixup_fdt

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change and it was merged. ( https://review.coreboot.org/c/coreboot/+/33134 )

Change subject: mb/sifive/hifive-unleashed: Check for errors in fixup_fdt
......................................................................

mb/sifive/hifive-unleashed: Check for errors in fixup_fdt

It is possible that cbfs_boot_map_with_leak() and malloc() could fail,
so detect those conditions and print error messages if they do.

Change-Id: I34951da0b73028c4c89446cb1779a72422997325
Signed-off-by: Jacob Garber 
Found-by: Coverity CID 1399147
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33134
Tested-by: build bot (Jenkins) 
Reviewed-by: Patrick Rudolph 
Reviewed-by: Xiang Wang 
---
M src/mainboard/sifive/hifive-unleashed/fixup_fdt.c
1 file changed, 12 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Patrick Rudolph: Looks good to me, approved
  Xiang Wang: Looks good to me, approved

diff --git a/src/mainboard/sifive/hifive-unleashed/fixup_fdt.c b/src/mainboard/sifive/hifive-unleashed/fixup_fdt.c
index ea58e02..8ac6ff1 100644
--- a/src/mainboard/sifive/hifive-unleashed/fixup_fdt.c
+++ b/src/mainboard/sifive/hifive-unleashed/fixup_fdt.c
@@ -15,6 +15,7 @@

#include <stdint.h>
 #include <string.h>
+#include <console/console.h>
 #include <soc/otp.h>
 #include <soc/sdram.h>
 #include <cbfs.h>
@@ -86,6 +87,11 @@
    /* load flat dt from cbfs */
    fdt_rom = cbfs_boot_map_with_leak("fallback/DTB", CBFS_TYPE_RAW, NULL);

+	if (fdt_rom == NULL) {
+		printk(BIOS_ERR, "Unable to load fallback/DTB from CBFS\n");
+		return;
+	}
+
    /* Expand DT into a tree */
    tree = fdt_unflatten(fdt_rom);

@@ -95,6 +101,12 @@

/* convert the tree to a flat dt */
    void *dt = malloc(dt_flat_size(tree));
+
+	if (dt == NULL) {
+		printk(BIOS_ERR, "Unable to allocate memory for flat device tree\n");
+		return;
+	}
+
    dt_flatten(tree, dt);

/* update HLS */