On Sun, 3 Jan 2021 at 21:11, Philippe Mathieu-Daudé <f4...@amsat.org> wrote:
>
> From: Huacai Chen <chenhua...@kernel.org>
>
> As suggested by Philippe Mathieu-Daudé, rework Loongson's liointc:
> 1, Move macro definitions to loongson_liointc.h;
> 2, Remove magic values and use macros instead;
> 3, Replace dead D() code by trace events.
>
> Suggested-by: Philippe Mathieu-Daudé <f4...@amsat.org>
> Signed-off-by: Huacai Chen <chenhua...@kernel.org>
> Tested-by: Philippe Mathieu-Daudé <f4...@amsat.org>
> Reviewed-by: Philippe Mathieu-Daudé <f4...@amsat.org>
> Message-Id: <20201221110538.3186646-2-chenhua...@kernel.org>
> Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
> ---
> include/hw/intc/loongson_liointc.h | 22 ++++++++++++++++++
> hw/intc/loongson_liointc.c | 36 +++++++++++++-----------------
> 2 files changed, 38 insertions(+), 20 deletions(-)
> create mode 100644 include/hw/intc/loongson_liointc.h
Hi; Coverity complains about a possible array overrun
in this commit:
> @@ -40,13 +39,10 @@
> #define R_IEN 0x24
> #define R_IEN_SET 0x28
> #define R_IEN_CLR 0x2c
> -#define R_PERCORE_ISR(x) (0x40 + 0x8 * x)
> +#define R_ISR_SIZE 0x8
> +#define R_START 0x40
> #define R_END 0x64
>
> -#define TYPE_LOONGSON_LIOINTC "loongson.liointc"
> -DECLARE_INSTANCE_CHECKER(struct loongson_liointc, LOONGSON_LIOINTC,
> - TYPE_LOONGSON_LIOINTC)
> -
> struct loongson_liointc {
> SysBusDevice parent_obj;
>
> @@ -123,14 +119,13 @@ liointc_read(void *opaque, hwaddr addr, unsigned int
> size)
> goto out;
> }
>
> - /* Rest is 4 byte */
> + /* Rest are 4 bytes */
> if (size != 4 || (addr % 4)) {
> goto out;
> }
>
> - if (addr >= R_PERCORE_ISR(0) &&
> - addr < R_PERCORE_ISR(NUM_CORES)) {
> - int core = (addr - R_PERCORE_ISR(0)) / 8;
> + if (addr >= R_START && addr < R_END) {
> + int core = (addr - R_START) / R_ISR_SIZE;
R_END is 0x64 and R_START is 0x40, so if addr is 0x60
then addr - R_START is 0x32 and so core here is 4.
However p->per_core_isr[] only has 4 entries, so this will
be off the end of the array.
This is CID 1438965.
> r = p->per_core_isr[core];
> goto out;
> }
> - if (addr >= R_PERCORE_ISR(0) &&
> - addr < R_PERCORE_ISR(NUM_CORES)) {
> - int core = (addr - R_PERCORE_ISR(0)) / 8;
> + if (addr >= R_START && addr < R_END) {
> + int core = (addr - R_START) / R_ISR_SIZE;
> p->per_core_isr[core] = value;
> goto out;
> }
Same thing here, CID 1438967.
thanks
-- PMM
