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reset: Annotate struct reset_control_array with __counted_by

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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 reset_control_array.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.

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

Cc: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230922175229.work.838-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2023-09-22 10:52:29 -07:00
parent 15fcedd43a
commit fed2ef7aba
1 changed files with 2 additions and 2 deletions
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4
drivers/reset/core.c
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@ -60,7 +60,7 @@ struct reset_control {
struct reset_control_array {
struct reset_control base;
unsigned int num_rstcs;
struct reset_control *rstc[];
struct reset_control *rstc[] __counted_by(num_rstcs);
};
static const char *rcdev_name(struct reset_controller_dev *rcdev)
@ -1185,6 +1185,7 @@ of_reset_control_array_get(struct device_node *np, bool shared, bool optional,
resets = kzalloc(struct_size(resets, rstc, num), GFP_KERNEL);
if (!resets)
return ERR_PTR(-ENOMEM);
resets->num_rstcs = num;
for (i = 0; i < num; i++) {
rstc = __of_reset_control_get(np, NULL, i, shared, optional,
@ -1193,7 +1194,6 @@ of_reset_control_array_get(struct device_node *np, bool shared, bool optional,
goto err_rst;
resets->rstc[i] = rstc;
}
resets->num_rstcs = num;
resets->base.array = true;
return &resets->base;