[PATCH v2] drm/amdkfd: Fix out-of-bounds read in kdf_create_vcrat_image_cpu()

[Jeremy Cline]

KASAN reported a slab-out-of-bounds read of size 1 in
kdf_create_vcrat_image_cpu().

This occurs when, for example, when on an x86_64 with a single NUMA node
because kfd_fill_iolink_info_for_cpu() is a no-op, but afterwards the
sub_type_hdr->length, which is out-of-bounds, is read and multiplied by
entries. Fortunately, entries is 0 in this case so the overall
crat_table->length is still correct.

Check if there were any entries before de-referencing sub_type_hdr which
may be pointing to out-of-bounds memory.

Fixes: b7b6c38529c9 ("drm/amdkfd: Calculate CPU VCRAT size dynamically (v2)")
Suggested-by: Felix Kuehling <Felix.Kuehling at amd.com>
Signed-off-by: Jeremy Cline <jcline at redhat.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
index 8cac497c2c45..a5640a6138cf 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
@@ -1040,11 +1040,14 @@ static int kfd_create_vcrat_image_cpu(void *pcrat_image, size_t *size)
 				(struct crat_subtype_iolink *)sub_type_hdr);
 		if (ret < 0)
 			return ret;
-		crat_table->length += (sub_type_hdr->length * entries);
-		crat_table->total_entries += entries;
 
-		sub_type_hdr = (typeof(sub_type_hdr))((char *)sub_type_hdr +
-				sub_type_hdr->length * entries);
+		if (entries) {
+			crat_table->length += (sub_type_hdr->length * entries);
+			crat_table->total_entries += entries;
+
+			sub_type_hdr = (typeof(sub_type_hdr))((char *)sub_type_hdr +
+					sub_type_hdr->length * entries);
+		}
 #else
 		pr_info("IO link not available for non x86 platforms\n");
 #endif
-- 
2.29.2