The GCC and Clang compilers provide the __counted_by_ptr attribute, which is used by KASAN and compiler bounds-checking to detect out-of-bounds accesses to pointer fields.
In "struct fsl_mc_io", the "portal_virt_addr" pointer points to the MC command portal virtual address. The size of this allocated portal in bytes is tracked by the "portal_size" field within the same structure. Annotate the "portal_virt_addr" pointer field with "__counted_by_ptr(portal_size)" to enable compiler bounds-checking and harden against potential out-of-bounds accesses. Cc: [email protected] Assisted-by: LLM Signed-off-by: Bill Wendling <[email protected]> --- include/linux/fsl/mc.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h index c25f0f7e6dd4..0b2c0eb9b605 100644 --- a/include/linux/fsl/mc.h +++ b/include/linux/fsl/mc.h @@ -336,7 +336,7 @@ struct fsl_mc_io { u16 flags; u32 portal_size; phys_addr_t portal_phys_addr; - void __iomem *portal_virt_addr; + void __iomem *portal_virt_addr __counted_by_ptr(portal_size); struct fsl_mc_device *dpmcp_dev; union { /* -- 2.55.0.1082.g2b9226bbc0-goog
