Change in coreboot[master]: lib/cbfs: Call rdev_unmap on hash mismatch

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/56576 )

Change subject: lib/cbfs: Call rdev_unmap on hash mismatch
......................................................................

lib/cbfs: Call rdev_unmap on hash mismatch

We don't want to leak any mappings.

BUG=b:179699789
TEST=none

Signed-off-by: Raul E Rangel 
Change-Id: Ibcd28ce12cbd5e221e8f4fa910fd8472bedb802f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56576
Tested-by: build bot (Jenkins) 
Reviewed-by: Julius Werner 
Reviewed-by: Karthik Ramasubramanian 
---
M src/lib/cbfs.c
1 file changed, 8 insertions(+), 1 deletion(-)

Approvals:
  build bot (Jenkins): Verified
  Julius Werner: Looks good to me, approved
  Karthik Ramasubramanian: Looks good to me, approved

diff --git a/src/lib/cbfs.c b/src/lib/cbfs.c
index 32b50da..52f7373 100644
--- a/src/lib/cbfs.c
+++ b/src/lib/cbfs.c
@@ -309,8 +309,15 @@
    	loc = allocator(arg, size, &mdata);
    } else if (compression == CBFS_COMPRESS_NONE) {
    	void *mapping = rdev_mmap_full(&rdev);
-		if (!mapping || cbfs_file_hash_mismatch(mapping, size, file_hash))
+
+		if (!mapping)
    		return NULL;
+
+		if (cbfs_file_hash_mismatch(mapping, size, file_hash)) {
+			rdev_munmap(&rdev, mapping);
+			return NULL;
+		}
+
    	return mapping;
    } else if (!CBFS_CACHE_AVAILABLE) {
    	ERROR("Cannot map compressed file %s on x86\n", mdata.h.filename);