6.18-stable review patch. If anyone has any objections, please let me know.
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From: Sergey Bashirov sergeybashirov@gmail.com
[ Upstream commit 3524b021b0ec620a76c89aee78e9d4b4130fb711 ]
The extent returned by the file system may have a smaller offset than the segment offset requested by the client. In this case, the minimum segment length must be checked against the requested range. Otherwise, the client may not be able to continue the read/write operation.
Fixes: 8650b8a05850 ("nfsd: pNFS block layout driver") Signed-off-by: Sergey Bashirov sergeybashirov@gmail.com Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Chuck Lever chuck.lever@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/nfsd/blocklayout.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c index fde5539cf6a69..425648565ab2d 100644 --- a/fs/nfsd/blocklayout.c +++ b/fs/nfsd/blocklayout.c @@ -23,6 +23,7 @@ nfsd4_block_proc_layoutget(struct svc_rqst *rqstp, struct inode *inode, { struct nfsd4_layout_seg *seg = &args->lg_seg; struct super_block *sb = inode->i_sb; + u64 length; u32 block_size = i_blocksize(inode); struct pnfs_block_extent *bex; struct iomap iomap; @@ -56,7 +57,8 @@ nfsd4_block_proc_layoutget(struct svc_rqst *rqstp, struct inode *inode, goto out_error; }
- if (iomap.length < args->lg_minlength) { + length = iomap.offset + iomap.length - seg->offset; + if (length < args->lg_minlength) { dprintk("pnfsd: extent smaller than minlength\n"); goto out_layoutunavailable; }