SRU reguest for LP#249340

[Stefan Bader]

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https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.22/+bug/249340

Applicable: Gutsy only

SRU justification:

Impact: The patch used to fix (CVE-2008-0598) mm: trim more holes
65e5414318c0af67e05d84664d5de3d9685c16be (gutsy) accidentally dropped a change
that fixed a endless loop in buffered write. This causes upgrades from gutsy to
hardy (and probably other rare cases) to hang.

Fix: Re-add the special case for 0 bytes copied when a zero length segment was
encountered.

Testcase: Verified on a virtual machine. Without the patch the upgrade will
hang, with this fix it will be sucessfull.

- --

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