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nfsd: more careful input validation in nfsctl write methods 

Neil Brown points out that we're checking buf[size-1] in a couple places
without first checking whether size is zero.

Actually, given the implementation of simple_transaction_get(), buf[-1]
is zero, so in both of these cases the subsequent check of the value of
buf[size-1] will catch this case.

But it seems fragile to depend on that, so add explicit checks for this
case.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Acked-by: NeilBrown <neilb@suse.de>
This commit is contained in:
J. Bruce Fields 2008-01-22 17:40:42 -05:00
parent 50431d94e7
commit 87d26ea777
1 changed files with 4 additions and 1 deletions
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5
fs/nfsd/nfsctl.c
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@ -304,6 +304,9 @@ static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
struct auth_domain *dom;
struct knfsd_fh fh;
if (size == 0)
return -EINVAL;
if (buf[size-1] != '\n')
return -EINVAL;
buf[size-1] = 0;
@ -663,7 +666,7 @@ static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
char *recdir;
int len, status;
if (size > PATH_MAX || buf[size-1] != '\n')
if (size == 0 || size > PATH_MAX || buf[size-1] != '\n')
return -EINVAL;
buf[size-1] = 0;