On Fri, Jul 31, 2020 at 06:41:57PM +0800, Zhiqiang Liu wrote:
>
> In vector_alloc_slot func, if REALLOC fails, it means new slot
> allocation fails. However, it just update v->allocated and then
> return the old v->slot without new slot. So, the caller will take
> the last old slot as the new allocated slot, and use it by calling
> vector_set_slot func. Finally, the data of last slot is lost.
>
Reviewed-by: Benjamin Marzinski <bmarz...@redhat.com>
> Here, if REALLOC or MALLOC fails, we will return NULL.
>
> Signed-off-by: Zhiqiang Liu <liuzhiqian...@huawei.com>
> Signed-off-by: lixiaokeng <lixiaok...@huawei.com>
> ---
> libmultipath/vector.c | 10 ++++++----
> 1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/libmultipath/vector.c b/libmultipath/vector.c
> index 501cf4c5..29dc9848 100644
> --- a/libmultipath/vector.c
> +++ b/libmultipath/vector.c
> @@ -49,12 +49,14 @@ vector_alloc_slot(vector v)
> else
> new_slot = (void *) MALLOC(sizeof (void *) * v->allocated);
>
> - if (!new_slot)
> + /* If REALLOC or MALLOC fails, it means new slot allocation fails, so
> return NULL. */
> + if (!new_slot) {
> v->allocated -= VECTOR_DEFAULT_SIZE;
> - else
> - v->slot = new_slot;
> + return NULL;
> + }
>
> - return v->slot;
> + v->slot = new_slot;
> + return v->slot[VECTOR_SIZE(v) - 1];
> }
>
> int
> --
> 2.24.0.windows.2
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