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i3c: master: cdns: Annotate struct cdns_i3c_xfer with __counted_by 

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 cdns_i3c_xfer.

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

Cc: "Przemysław Gaj" <pgaj@cadence.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: linux-i3c@lists.infradead.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230922175014.work.637-kees@kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Kees Cook 2023-09-22 10:50:15 -07:00 committed by Alexandre Belloni
parent 014c9a0e6f
commit 49f33846ef
1 changed files with 1 additions and 1 deletions
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2
drivers/i3c/master/i3c-master-cdns.c
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@ -387,7 +387,7 @@ struct cdns_i3c_xfer {
struct completion comp;
int ret;
unsigned int ncmds;
struct cdns_i3c_cmd cmds[];
struct cdns_i3c_cmd cmds[] __counted_by(ncmds);
};
struct cdns_i3c_data {