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>

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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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