On Mon, Aug 19, 2019 at 08:55:20AM +0800, Pan Bian wrote:
> The function kmalloc is called to allocate memory if bs is NULL.
> However, mempool_free is used to release the memory chunk even if bs is
> NULL in the error hanlding code. This patch checks bs and use the
> correct function to release memory.
>
>
> Fixes: 3f86a82aeb ("block: Consolidate bio_alloc_bioset(), bio_kmalloc()")
> Signed-off-by: Pan Bian <bianpan2016@xxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---
> V2: add Fixes and Cc tags
> ---
> block/bio.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/block/bio.c b/block/bio.c
> index 299a0e7..c5f5238 100644
> --- a/block/bio.c
> +++ b/block/bio.c
> @@ -515,7 +515,10 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, unsigned int nr_iovecs,
> return bio;
>
> err_free:
> - mempool_free(p, &bs->bio_pool);
> + if (!bs)
> + kfree(p);
> + else
> + mempool_free(p, &bs->bio_pool);
> return NULL;
> }
> EXPORT_SYMBOL(bio_alloc_bioset);
'err_free' is only reached in case that 'bs' isn't NULL, so this patch
fixes nothing.
Thanks,
Ming
