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NFSD: Annotate struct pnfs_block_deviceaddr with __counted_by()

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Add the __counted_by compiler attribute to the flexible array member
volumes to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.

Use struct_size() instead of manually calculating the number of bytes to
allocate for a pnfs_block_deviceaddr with a single volume.

Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Acked-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Thorsten Blum 2024-08-28 23:42:55 +02:00 committed by Chuck Lever
parent d078cbf5c3
commit 2869b3a00e
2 changed files with 3 additions and 5 deletions
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6
fs/nfsd/blocklayout.c
View File

@ -147,8 +147,7 @@ nfsd4_block_get_device_info_simple(struct super_block *sb,
struct pnfs_block_deviceaddr *dev;
struct pnfs_block_volume *b;
dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
sizeof(struct pnfs_block_volume), GFP_KERNEL);
dev = kzalloc(struct_size(dev, volumes, 1), GFP_KERNEL);
if (!dev)
return -ENOMEM;
gdp->gd_device = dev;
@ -255,8 +254,7 @@ nfsd4_block_get_device_info_scsi(struct super_block *sb,
const struct pr_ops *ops;
int ret;
dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
sizeof(struct pnfs_block_volume), GFP_KERNEL);
dev = kzalloc(struct_size(dev, volumes, 1), GFP_KERNEL);
if (!dev)
return -ENOMEM;
gdp->gd_device = dev;

2
fs/nfsd/blocklayoutxdr.h
View File

@ -47,7 +47,7 @@ struct pnfs_block_volume {
struct pnfs_block_deviceaddr {
u32 nr_volumes;
struct pnfs_block_volume volumes[];
struct pnfs_block_volume volumes[] __counted_by(nr_volumes);
};
__be32 nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,