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media: rc: bpf attach/detach requires write permission

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Note that bpf attach/detach also requires CAP_NET_ADMIN.

Cc: stable@vger.kernel.org
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Sean Young
2023-04-13 10:50:32 +02:00
committed by CrazyCat
parent 081aec6c32
commit e8c0f70280
1 changed files with 4 additions and 1 deletions
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5
drivers/media/rc/lirc_dev.c
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@@ -813,7 +813,7 @@ void __exit lirc_dev_exit(void)
unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX); unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX);
} }
struct rc_dev *rc_dev_get_from_fd(int fd) struct rc_dev *rc_dev_get_from_fd(int fd, bool write)
{ {
struct fd f = fdget(fd); struct fd f = fdget(fd);
struct lirc_fh *fh; struct lirc_fh *fh;
@@ -827,6 +827,9 @@ struct rc_dev *rc_dev_get_from_fd(int fd)
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
} }
if (write && !(f.file->f_mode & FMODE_WRITE))
return ERR_PTR(-EPERM);
fh = f.file->private_data; fh = f.file->private_data;
dev = fh->rc; dev = fh->rc;