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fix a bug where we access a bread buffer after we have brelse'd it...

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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
This commit is contained in:
jmg 2013-09-25 02:48:12 +00:00
parent d965f28ba1
commit 903f65948b
1 changed files with 5 additions and 5 deletions
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10
sys/fs/cd9660/cd9660_vfsops.c
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@ -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;