From: Nathan Chancellor <nathan@xxxxxxxxxx>
commit 1c07c9be87dd3dd0634033bf08728b32465f08fb upstream.
Work for __counted_by on generic pointers in structures (not just
flexible array members) has started landing in Clang 19 (current tip of
tree). During the development of this feature, a restriction was added
to __counted_by to prevent the flexible array member's element type from
including a flexible array member itself such as:
struct foo {
int count;
char buf[];
};
struct bar {
int count;
struct foo data[] __counted_by(count);
};
because the size of data cannot be calculated with the standard array
size formula:
sizeof(struct foo) * count
This restriction was downgraded to a warning but due to CONFIG_WERROR,
it can still break the build. The application of __counted_by on the
ports member of 'struct mxser_board' triggers this restriction,
resulting in:
drivers/tty/mxser.c:291:2: error: 'counted_by' should not be applied to an array with element of unknown size because 'struct mxser_port' is a struct type with a flexible array member. This will be an error in a future compiler version [-Werror,-Wbounds-safety-counted-by-elt-type-unknown-size]
291 | struct mxser_port ports[] __counted_by(nports);
| ^~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
Remove this use of __counted_by to fix the warning/error. However,
rather than remove it altogether, leave it commented, as it may be
possible to support this in future compiler releases.
Cc: <stable@xxxxxxxxxxxxxxx>
Closes: https://github.com/ClangBuiltLinux/linux/issues/2026
Fixes: f34907ecca71 ("mxser: Annotate struct mxser_board with __counted_by")
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240529-drop-counted-by-ports-mxser-board-v1-1-0ab217f4da6d@xxxxxxxxxx
Signed-off-by: Kees Cook <kees@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/mxser.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -288,7 +288,7 @@ struct mxser_board {
enum mxser_must_hwid must_hwid;
speed_t max_baud;
- struct mxser_port ports[] __counted_by(nports);
+ struct mxser_port ports[] /* __counted_by(nports) */;
};
static DECLARE_BITMAP(mxser_boards, MXSER_BOARDS);
Patches currently in stable-queue which might be from nathan@xxxxxxxxxx are
queue-6.9/nvmet-fc-remove-__counted_by-from-nvmet_fc_tgt_queue.fod.patch
queue-6.9/kbuild-rpm-pkg-fix-build-error-with-config_modules-n.patch
queue-6.9/tty-mxser-remove-__counted_by-from-mxser_board.ports.patch
