tree b95ccb140532df8601f69f86fb3ccb8dbd80a7ea
parent dcb3b83febd1028afbc4a32cf7642a6580e349c6
author Jesper Juhl <jesper.juhl@gmail.com> 1187245542 +1000
committer Tim Shimmin <tes@chook.melbourne.sgi.com> 1192430568 +1000

[XFS] Fix a potential NULL pointer deref in XFS on failed mount.

If we fail to open the the log device buftarg, we can fall through to
error handling code that fails to check for a NULL log device buftarg
before calling xfs_free_buftarg().

This patch fixes the issue by checking mp->m_logdev_targp against NULL in
xfs_unmountfs_close() and doing the proper xfs_blkdev_put(logdev); and
xfs_blkdev_put(rtdev); on (!mp->m_rtdev_targp) in xfs_mount().

Discovered by the Coverity checker.

SGI-PV: 968563
SGI-Modid: xfs-linux-melb:xfs-kern:29328a

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>