core: prevent allocation when exception index tables are empty

This change prevent the core from allocating memory, mapping and other resources to map exception index tables that are all empty. Signed-off-by: Etienne Carriere <[email protected]> Reviewed-by: Jerome Forissier <[email protected]>
lsun100 · Oct 5, 2018 · b2322fd · b2322fd
1 parent 1330634
commit b2322fd
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/core/arch/arm/kernel/user_ta.c b/core/arch/arm/kernel/user_ta.c
@@ -911,6 +911,13 @@ static TEE_Result set_exidx(struct user_ta_ctx *utc)
 	TAILQ_FOREACH(elf, &utc->elfs, link)
 		exidx_sz += elf->exidx_size;
 
+	if (!exidx_sz) {
+		/* The empty table from first segment will fit */
+		utc->exidx_start = exe->exidx_start;
+		utc->exidx_size = exe->exidx_size;
+		return TEE_SUCCESS;
+	}
+
 	utc->mobj_exidx = alloc_ta_mem(exidx_sz);
 	if (!utc->mobj_exidx)
 		return TEE_ERROR_OUT_OF_MEMORY;