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(parent: cfcf6a9) | patch
sysfs: correctly handle short reads on PREALLOC attrs.
authorNeilBrown <neilb@suse.com>
Wed, 5 Aug 2015 22:27:55 +0000 (08:27 +1000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 4 Oct 2015 18:42:22 +0000 (19:42 +0100)
commit65da3484d9be5664f5f7d2378e438bb2794f40b8
tree886ed45dc33cdfd927a395fceccbe2bd3d5cc4b5tree | snapshot (tar.gz zip)
parentcfcf6a91aa0d59faddb423a65230eea7f230d057commit | diff
sysfs: correctly handle short reads on PREALLOC attrs.

attributes declared with __ATTR_PREALLOC use sysfs_kf_read()
which ignores the 'count' arg.
So a 1-byte read request can return more bytes than that.

This is seen with the 'dash' shell when 'read' is used on
some 'md' sysfs attributes.

So only return the 'min' of count and the attribute length.

Signed-off-by: NeilBrown <neilb@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/sysfs/file.c diff | blob | blame | history