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| author | Andrew Price <anprice@redhat.com> | 2024-03-11 18:40:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-05-17 12:43:50 +0300 |
| commit | a93f5806e70c930c22fd6c2f1a907184bccc41e4 (patch) | |
| tree | 94297d932338c3a8d040b740db0d37d09877a1aa | |
| parent | 2ffd47decade3ec9b788da613b8dd3ed961a14ba (diff) | |
| download | linux-a93f5806e70c930c22fd6c2f1a907184bccc41e4.tar.xz | |
gfs2: Fix invalid metadata access in punch_hole
[ Upstream commit c95346ac918c5badf51b9a7ac58a26d3bd5bb224 ]
In punch_hole(), when the offset lies in the final block for a given
height, there is no hole to punch, but the maximum size check fails to
detect that. Consequently, punch_hole() will try to punch a hole beyond
the end of the metadata and fail. Fix the maximum size check.
Signed-off-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/gfs2/bmap.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c index 63e925aa12a7..1dc0f0bca3ab 100644 --- a/fs/gfs2/bmap.c +++ b/fs/gfs2/bmap.c @@ -1760,7 +1760,8 @@ static int punch_hole(struct gfs2_inode *ip, u64 offset, u64 length) struct buffer_head *dibh, *bh; struct gfs2_holder rd_gh; unsigned int bsize_shift = sdp->sd_sb.sb_bsize_shift; - u64 lblock = (offset + (1 << bsize_shift) - 1) >> bsize_shift; + unsigned int bsize = 1 << bsize_shift; + u64 lblock = (offset + bsize - 1) >> bsize_shift; __u16 start_list[GFS2_MAX_META_HEIGHT]; __u16 __end_list[GFS2_MAX_META_HEIGHT], *end_list = NULL; unsigned int start_aligned, end_aligned; @@ -1771,7 +1772,7 @@ static int punch_hole(struct gfs2_inode *ip, u64 offset, u64 length) u64 prev_bnr = 0; __be64 *start, *end; - if (offset >= maxsize) { + if (offset + bsize - 1 >= maxsize) { /* * The starting point lies beyond the allocated meta-data; * there are no blocks do deallocate. |