Author: jmg
Date: Wed Sep 25 02:48:12 2013
New Revision: 255866
URL: http://svnweb.freebsd.org/changeset/base/255866
Log:
fix a bug where we access a bread buffer after we have brelse'd it...
The kernel normally didn't unmap/context switch away before we accessed
the buffer most of the time, but under heavy I/O pressure and lots of
mount/unmounting this would cause a fault on nofault panic...
Reviewed by: dteske
Approved by: re (kib)
Sponsored by: Vicor
MFC after: 3 days
Modified:
head/sys/fs/cd9660/cd9660_vfsops.c
Modified: head/sys/fs/cd9660/cd9660_vfsops.c
==============================================================================
--- head/sys/fs/cd9660/cd9660_vfsops.c Wed Sep 25 01:48:45 2013
(r255865)
+++ head/sys/fs/cd9660/cd9660_vfsops.c Wed Sep 25 02:48:12 2013
(r255866)
@@ -390,11 +390,11 @@ iso_mountfs(devvp, mp)
/* Check the Rock Ridge Extension support */
if (!(isomp->im_flags & ISOFSMNT_NORRIP)) {
- if ((error = bread(isomp->im_devvp,
- (isomp->root_extent +
isonum_711(rootp->ext_attr_length)) <<
- (isomp->im_bshift - DEV_BSHIFT),
- isomp->logical_block_size, NOCRED, &bp)) != 0)
- goto out;
+ if ((error = bread(isomp->im_devvp, (isomp->root_extent +
+ isonum_711(((struct iso_directory_record *)isomp->root)->
+ ext_attr_length)) << (isomp->im_bshift - DEV_BSHIFT),
+ isomp->logical_block_size, NOCRED, &bp)) != 0)
+ goto out;
rootp = (struct iso_directory_record *)bp->b_data;
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