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Subject[PATCH] usb: Annotate struct urb_priv with __counted_by
Date
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct urb_priv.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mathias Nyman <mathias.nyman@intel.com>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
drivers/usb/host/ohci.h | 2 +-
drivers/usb/host/xhci.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h
index aac6285b37f8..1aba22784e05 100644
--- a/drivers/usb/host/ohci.h
+++ b/drivers/usb/host/ohci.h
@@ -337,7 +337,7 @@ typedef struct urb_priv {
u16 length; // # tds in this request
u16 td_cnt; // tds already serviced
struct list_head pending;
- struct td *td[]; // all TDs in this request
+ struct td *td[] __counted_by(length); // all TDs in this request

} urb_priv_t;

diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 7e282b4522c0..2f21c3a8565c 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1666,7 +1666,7 @@ struct xhci_scratchpad {
struct urb_priv {
int num_tds;
int num_tds_done;
- struct xhci_td td[];
+ struct xhci_td td[] __counted_by(num_tds);
};

/*
--
2.34.1
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