From: Anton Altaparmakov Date: Fri, 28 Jan 2011 20:45:28 +0000 (+0000) Subject: NTFS: Fix invalid pointer dereference in ntfs_mft_record_alloc(). X-Git-Tag: v2.6.38-rc3~15 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=af5eb745efe97d91d2cbe793029838b3311c15da;p=pandora-kernel.git NTFS: Fix invalid pointer dereference in ntfs_mft_record_alloc(). In ntfs_mft_record_alloc() when mapping the new extent mft record with map_extent_mft_record() we overwrite @m with the return value and on error, we then try to use the old @m but that is no longer there as @m now contains an error code instead so we crash when dereferencing the error code as if it were a pointer. The simple fix is to use a temporary variable to store the return value thus preserving the original @m for later use. This is a backport from the commercial Tuxera-NTFS driver and is well tested... Thanks go to Julia Lawall for pointing this out (whilst I had fixed it in the commercial driver I had failed to fix it in the Linux kernel). Signed-off-by: Anton Altaparmakov Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed