[Bugs] [Bug 1476324] md-cache: xattr values should not be checked with string functions

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1476324



--- Comment #4 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/17910 committed in master by Jeff Darcy
(jeff at pl.atyp.us) 
------
commit ab4ffdac9dec1867f2d9b33242179cf2b347319d
Author: Günther Deschner <gd at samba.org>
Date:   Fri Jul 28 13:38:16 2017 +0200

    md-cache: avoid checking the xattr value buffer with string functions.

    xattrs may very well contain binary, non-text data with leading 0
    values. Using strcmp for checking empty values is not the appropriate
    thing to do: In the best case, it might treat a binary xattr value
    starting with 0 from being cached (and hence also from being reported
    back with xattr). In the worst case, we might read beyond the end
    of a data blob that does contain any zero byte.

    We fix this by checking the length of the data blob and checking
    the first byte against 0 if the length is one.

    Signed-off-by: Guenther Deschner <gd at samba.org>
    Pair-Programmed-With: Michael Adam <obnox at samba.org>
    Change-Id: If723c465a630b8a37b6be58782a2724df7ac6b11
    BUG: 1476324
    Reviewed-on: https://review.gluster.org/17910
    Reviewed-by: Michael Adam <obnox at samba.org>
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Poornima G <pgurusid at redhat.com>
    Tested-by: Poornima G <pgurusid at redhat.com>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>

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