On Tuesday, January 01/26/21, 2021 at 10:50:13 +0800, Yang Li wrote:
> Fix below warnings reported by coccicheck:
> ./drivers/net/ethernet/chelsio/cxgb4/clip_tbl.c:323:3-9: WARNING:
> NULL check before some freeing functions is not needed.
> ./drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c:3554:2-8: WARNING:
> NULL check before some freeing functions is not needed.
> ./drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c:157:2-7: WARNING:
> NULL check before some freeing functions is not needed.
> ./drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c:525:3-9: WARNING:
> NULL check before some freeing functions is not needed.
>
> Reported-by: Abaci Robot <ab...@linux.alibaba.com>
> Signed-off-by: Yang Li <abaci-bug...@linux.alibaba.com>
> ---
> drivers/net/ethernet/chelsio/cxgb4/clip_tbl.c | 3 +--
> drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c | 3 +--
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c | 3 +--
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c | 6 ++----
> 4 files changed, 5 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/clip_tbl.c
> b/drivers/net/ethernet/chelsio/cxgb4/clip_tbl.c
> index ce28820..12fcf84 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/clip_tbl.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/clip_tbl.c
> @@ -323,8 +323,7 @@ void t4_cleanup_clip_tbl(struct adapter *adap)
> struct clip_tbl *ctbl = adap->clipt;
>
> if (ctbl) {
> - if (ctbl->cl_list)
> - kvfree(ctbl->cl_list);
> + kvfree(ctbl->cl_list);
> kvfree(ctbl);
> }
> }
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
> b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
> index 75474f8..94eb8a6 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
> @@ -3554,8 +3554,7 @@ int cudbg_collect_qdesc(struct cudbg_init *pdbg_init,
> }
>
> out_free:
> - if (data)
> - kvfree(data);
> + kvfree(data);
>
> #undef QDESC_GET_FLQ
> #undef QDESC_GET_RXQ
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c
> b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c
> index 77648e4..dd66b24 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c
> @@ -157,8 +157,7 @@ static int cudbg_alloc_compress_buff(struct cudbg_init
> *pdbg_init)
>
> static void cudbg_free_compress_buff(struct cudbg_init *pdbg_init)
> {
> - if (pdbg_init->compress_buff)
NAK. The above check is necessary.
pdbg_init->compress_buff may be NULL when Zlib is unavailable or when
pdbg_init->compress_buff allocation fails, in which case we ignore error
and continue without compression. Check is necessary before calling
vfree().
> - vfree(pdbg_init->compress_buff);
> + vfree(pdbg_init->compress_buff);
> }
>
> int cxgb4_cudbg_collect(struct adapter *adap, void *buf, u32 *buf_size,
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c
> b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c
> index dede025..97a811f 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c
> @@ -525,12 +525,10 @@ struct cxgb4_tc_u32_table *cxgb4_init_tc_u32(struct
> adapter *adap)
> for (i = 0; i < t->size; i++) {
> struct cxgb4_link *link = &t->table[i];
>
> - if (link->tid_map)
> - kvfree(link->tid_map);
> + kvfree(link->tid_map);
The above change is wrong. NAK.
If the call to link->tid_map = kvcalloc() above fails, it still
goes ahead and calls kvfree(link->tid_map) even for failed cases, which is
wrong. Check is necessary before calling kvfree().
> }
>
> - if (t)
> - kvfree(t);
> + kvfree(t);
>
> return NULL;
> }
> --
> 1.8.3.1
>
