sys: usermode: Document 0 size buffer memory check

Documenting that 0 size buffer has undefined behavior. See: #23239 Signed-off-by: Flavio Ceolin <[email protected]>
zephyrproject-rtos · Mar 24, 2020 · edf2f0b · edf2f0b
1 parent 15c2573
commit edf2f0b
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/kernel/include/kernel_internal.h b/kernel/include/kernel_internal.h
@@ -137,6 +137,8 @@ extern void z_arch_mem_domain_destroy(struct k_mem_domain *domain);
  * if the supplied memory buffer spans multiple enabled memory management
  * regions (even if all such regions permit user access).
  *
+ * @warning 0 size buffer has undefined behavior.
+ *
  * @param addr start address of the buffer
  * @param size the size of the buffer
  * @param write If nonzero, additionally check if the area is writable.