From: David Howells <dhowells@redhat.com>
Date: Thu, 27 Aug 2009 12:09:06 +0000 (+0100)
Subject: AFS: Stop readlink() on AFS crashing due to NULL 'file' ptr
X-Git-Tag: v2.6.31-rc8~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9886e836a6a5dbd273dc55b17e713f0a188d137f;p=pandora-kernel.git

AFS: Stop readlink() on AFS crashing due to NULL 'file' ptr

kAFS crashes when asked to read a symbolic link because page_getlink()
passes a NULL file pointer to read_mapping_page(), but afs_readpage()
expects a file pointer from which to extract a key.

Modify afs_readpage() to request the appropriate key from the calling
process's keyrings if a file struct is not supplied with one attached.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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