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NFSD: prevent underflow in nfssvc_decode_writeargs()

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commit 184416d4b98509fb4c3d8fc3d6dc1437896cc159 upstream.

Smatch complains:

	fs/nfsd/nfsxdr.c:341 nfssvc_decode_writeargs()
	warn: no lower bound on 'args->len'

Change the type to unsigned to prevent this issue.

Cc: stable@vger.kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2022-03-15 13:30:09 +03:00 • committed by Greg Kroah-Hartman
commit 85259340fc
2 changed files with 2 additions and 2 deletions
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2
fs/nfsd/nfsproc.c
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@ -230,7 +230,7 @@ nfsd_proc_write(struct svc_rqst *rqstp)
unsigned long cnt = argp->len;
unsigned int nvecs;
dprintk("nfsd: WRITE %s %d bytes at %d\n",
dprintk("nfsd: WRITE %s %u bytes at %d\n",
SVCFH_fmt(&argp->fh),
argp->len, argp->offset);

2
fs/nfsd/xdr.h
View file

@ -33,7 +33,7 @@ struct nfsd_readargs {
struct nfsd_writeargs {
svc_fh fh;
__u32 offset;
int len;
__u32 len;
struct kvec first;
};