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lib/string_helpers: annotate struct strarray with __counted_by_ptr

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Add the __counted_by_ptr() compiler attribute to 'array' to improve
bounds checking via CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Link: https://patch.msgid.link/20260415122542.370926-6-thorsten.blum@linux.dev
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Thorsten Blum 2026-04-15 14:25:45 +02:00 committed by Kees Cook
parent 233e1ab980
commit 8f64fb098a
1 changed files with 2 additions and 2 deletions
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4
lib/string_helpers.c
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@ -805,7 +805,7 @@ void kfree_strarray(char **array, size_t n)
EXPORT_SYMBOL_GPL(kfree_strarray);
struct strarray {
char **array;
char **array __counted_by_ptr(n);
size_t n;
};
@ -824,13 +824,13 @@ char **devm_kasprintf_strarray(struct device *dev, const char *prefix, size_t n)
if (!ptr)
return ERR_PTR(-ENOMEM);
ptr->n = n;
ptr->array = kasprintf_strarray(GFP_KERNEL, prefix, n);
if (!ptr->array) {
devres_free(ptr);
return ERR_PTR(-ENOMEM);
}
ptr->n = n;
devres_add(dev, ptr);
return ptr->array;