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SubjectRe: [PATCH v3 1/3] mm/shmem: check return value of shmem_init_inodecache
On Mon, 6 Jun 2022, Chen Wandun wrote:

> It will result in null pointer access if shmem_init_inodecache fail,
> so check return value of shmem_init_inodecache
>
> Signed-off-by: Chen Wandun <chenwandun@huawei.com>

Thank you, but NAK.

It's a pity that you've been put to the trouble of sending a v3, sorry
about that: but if SLAB_PANIC no longer works, or panic() has taken to
returning, then that's what needs fixing, not shmem_init_inodecache().

Was this one supposed to be the bugfix? And I'm afraid I don't care
for your "cleanups" in 2/3 and 3/3 either: a matter of taste, and our
tastes differ.

I'd rather not spend the time on these: maybe look for somewhere else
to change around than mm/shmem.c? Or better, please help us all by
using your time to review the functional patches being posted.

Thanks,
Hugh

> ---
> mm/shmem.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/mm/shmem.c b/mm/shmem.c
> index 12d45a03f7fc..7419ab219b97 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -3775,11 +3775,16 @@ static void shmem_init_inode(void *foo)
> inode_init_once(&info->vfs_inode);
> }
>
> -static void shmem_init_inodecache(void)
> +static int shmem_init_inodecache(void)
> {
> shmem_inode_cachep = kmem_cache_create("shmem_inode_cache",
> sizeof(struct shmem_inode_info),
> 0, SLAB_PANIC|SLAB_ACCOUNT, shmem_init_inode);
> +
> + if (!shmem_inode_cachep)
> + return -ENOMEM;
> +
> + return 0;
> }
>
> static void shmem_destroy_inodecache(void)
> @@ -3923,7 +3928,9 @@ void __init shmem_init(void)
> {
> int error;
>
> - shmem_init_inodecache();
> + error = shmem_init_inodecache();
> + if (error)
> + goto out2;
>
> error = register_filesystem(&shmem_fs_type);
> if (error) {
> --
> 2.25.1

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