From 7aed976c4207bda126f41475eebaf8162b6a0ce4 Mon Sep 17 00:00:00 2001 From: Bill Wendling Date: Tue, 22 Sep 2026 22:35:38 +0000 Subject: bus: fsl-mc: Annotate fsl_mc_io.portal_virt_addr with __counted_by_ptr 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: codemender-patching+linux@google.com Assisted-by: LLM Signed-off-by: Bill Wendling Reviewed-by: Ioana Ciornei Reviewed-by: Gustavo A. R. Silva Link: https://lore.kernel.org/r/20260922223538.2287676-1-morbo@google.com Signed-off-by: Christophe Leroy (CS GROUP) --- include/linux/fsl/mc.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux') 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 { /* -- cgit v1.2.3