Author: royger
Date: Thu Jul 30 15:28:06 2015
New Revision: 286076
URL: https://svnweb.freebsd.org/changeset/base/286076
Log:
vfs: fix off-by-one error in vfs_buf_check_mapped
The check added in r285872 can trigger for valid buffers if the buffer space
used happens to be just after unmapped_buf in KVA space.
Discussed with: kib
Sponsored by: Citrix Systems R&D
Modified:
head/sys/kern/vfs_bio.c
Modified: head/sys/kern/vfs_bio.c
==============================================================================
--- head/sys/kern/vfs_bio.c Thu Jul 30 14:44:13 2015 (r286075)
+++ head/sys/kern/vfs_bio.c Thu Jul 30 15:28:06 2015 (r286076)
@@ -955,7 +955,7 @@ vfs_buf_check_mapped(struct buf *bp)
("mapped buf: b_kvabase was not updated %p", bp));
KASSERT(bp->b_data != unmapped_buf,
("mapped buf: b_data was not updated %p", bp));
- KASSERT(bp->b_data < unmapped_buf || bp->b_data > unmapped_buf +
+ KASSERT(bp->b_data < unmapped_buf || bp->b_data => unmapped_buf +
MAXPHYS, ("b_data + b_offset unmapped %p", bp));
}
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