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RDMA/qib: Validate ->show()/store() callbacks before calling them

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The permissions of the read-only or write-only sysfs files can be
changed (as root) and the user can then try to read a write-only file or
write to a read-only file which will lead to kernel crash here.

Protect against that by always validating the show/store callbacks.

Link: https://lore.kernel.org/r/d45cc26361a174ae12dbb86c994ef334d257924b.1573096807.git.viresh.kumar@linaro.org
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Viresh Kumar 2019-11-07 08:50:25 +05:30 committed by Jason Gunthorpe
parent da046d5f89
commit 7ee23491b3
1 changed files with 6 additions and 0 deletions
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6
drivers/infiniband/hw/qib/qib_sysfs.c
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@ -301,6 +301,9 @@ static ssize_t qib_portattr_show(struct kobject *kobj,
struct qib_pportdata *ppd =
container_of(kobj, struct qib_pportdata, pport_kobj);
if (!pattr->show)
return -EIO;
return pattr->show(ppd, buf);
}
@ -312,6 +315,9 @@ static ssize_t qib_portattr_store(struct kobject *kobj,
struct qib_pportdata *ppd =
container_of(kobj, struct qib_pportdata, pport_kobj);
if (!pattr->store)
return -EIO;
return pattr->store(ppd, buf, len);
}