On Thu, Feb 02, 2023 at 07:05:43PM +0800, Zheng Wang wrote:
> In btree_split, btree_node_alloc_replacement() is assigned to
> n1 and return error code or NULL on failure. n1->c->cache is
> passed to block_bytes. So there is a dereference of it
> without checks, which may lead to wild pointer dereference or
> NULL pointer dereference depending on n1. The initial code only
> judge the error code but igore the NULL pointer.
> So does n2 and n3.
>
> Fix this bug by adding IS_ERR_OR_NULL check of n1, n2 and n3.
>
> Note that, as a bug found by static analysis, it can be a false
> positive or hard to trigger.
>
> Fixes: cafe56359144 ("bcache: A block layer cache")
> Signed-off-by: Zheng Wang <zyytlz.wz@xxxxxxx>
> ---
> drivers/md/bcache/btree.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
Note, there is no need to cc: security@k.o on any of these patches that
you send to public mailing lists, as the development and discussion of
them should happen there instead.
thanks,
greg k-h
