[Bugs] [Bug 1499893] md-cache: xattr values should not be checked with string functions

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1499893



--- Comment #2 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/18460 committed in release-3.10 by
Shyamsundar Ranganathan (srangana at redhat.com) 
------
commit 83615a663c1ac17812c8417dc56b85be600d17e3
Author: Günther Deschner <gd at samba.org>
Date:   Mon Oct 9 18:05:03 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>
    > (cherry picked from commit ab4ffdac9dec1867f2d9b33242179cf2b347319d)

    Change-Id: If723c465a630b8a37b6be58782a2724df7ac6b11
    BUG: 1499893
    Signed-off-by: Günther Deschner <gd at samba.org>

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