https://github.com/torvalds/linux
Revision 49a068f82a1d30eb585d7804b05948376be6cf9a authored by J. Bruce Fields on 22 December 2014, 21:14:51 UTC, committed by J. Bruce Fields on 07 January 2015, 19:03:58 UTC
A struct xdr_stream at a page boundary might point to the end of one
page or the beginning of the next, but xdr_truncate_encode isn't
prepared to handle the former.

This can cause corruption of NFSv4 READDIR replies in the case that a
readdir entry that would have exceeded the client's dircount/maxcount
limit would have ended exactly on a 4k page boundary.  You're more
likely to hit this case on large directories.

Other xdr_truncate_encode callers are probably also affected.

Reported-by: Holger Hoffstätte <holger.hoffstaette@googlemail.com>
Tested-by: Holger Hoffstätte <holger.hoffstaette@googlemail.com>
Fixes: 3e19ce762b53 "rpc: xdr_truncate_encode"
Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
1 parent 94ae1db
History
Tip revision: 49a068f82a1d30eb585d7804b05948376be6cf9a authored by J. Bruce Fields on 22 December 2014, 21:14:51 UTC
rpc: fix xdr_truncate_encode to handle buffer ending on page boundary
Tip revision: 49a068f
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