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SubjectRe: [RFC patch 25/41] mm/kasan: Simplify stacktrace handling
On Wed, Apr 10, 2019 at 12:28:19PM +0200, Thomas Gleixner wrote:
> Replace the indirection through struct stack_trace by using the storage
> array based interfaces.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
> Cc: Alexander Potapenko <glider@google.com>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Cc: kasan-dev@googlegroups.com
> Cc: linux-mm@kvack.org
> ---
> mm/kasan/common.c | 30 ++++++++++++------------------
> mm/kasan/report.c | 7 ++++---
> 2 files changed, 16 insertions(+), 21 deletions(-)
>
> --- a/mm/kasan/common.c
> +++ b/mm/kasan/common.c
> @@ -48,34 +48,28 @@ static inline int in_irqentry_text(unsig
> ptr < (unsigned long)&__softirqentry_text_end);
> }
>
> -static inline void filter_irq_stacks(struct stack_trace *trace)
> +static inline unsigned int filter_irq_stacks(unsigned long *entries,
> + unsigned int nr_entries)
> {
> - int i;
> + unsigned int i;
>
> - if (!trace->nr_entries)
> - return;
> - for (i = 0; i < trace->nr_entries; i++)
> - if (in_irqentry_text(trace->entries[i])) {
> + for (i = 0; i < nr_entries; i++) {
> + if (in_irqentry_text(entries[i])) {
> /* Include the irqentry function into the stack. */
> - trace->nr_entries = i + 1;
> - break;
> + return i + 1;

Isn't this an off-by-one error if "i" points to the last entry of the
array?

--
Josh

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