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vfs: fix off-by-one error in vfs_buf_check_mapped

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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
This commit is contained in:
royger 2015-07-30 15:28:06 +00:00
parent b1425be92a
commit 21ecb47de2
1 changed files with 1 additions and 1 deletions
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2
sys/kern/vfs_bio.c
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@ -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));
}