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cifs: return error on invalid value written to cifsFYI

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RHBZ: 1539617

Check that, if it is not a boolean, the value the user tries
to write to /proc/fs/cifs/cifsFYI is valid and return an error
if not.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reported-by: Xiaoli Feng <xifeng@redhat.com>
This commit is contained in:
Ronnie Sahlberg 2018-05-24 09:53:39 +10:00 committed by Steve French
parent 57c55cd7c7
commit 25ad1cbd02
1 changed files with 2 additions and 0 deletions
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2
fs/cifs/cifs_debug.c
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@ -584,6 +584,8 @@ static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
cifsFYI = bv;
else if ((c[0] > '1') && (c[0] <= '9'))
cifsFYI = (int) (c[0] - '0'); /* see cifs_debug.h for meanings */
else
return -EINVAL;
return count;
}