scsi: lpfc: Fix some error codes in debugfs

commit 19f1bc7edf0f97186810e13a88f5b62069d89097 upstream.

If copy_from_user() or kstrtoull() fail then the correct behavior is to
return a negative error code.

Link: https://lore.kernel.org/r/YEsbU/UxYypVrC7/@mwanda
Fixes: f9bb2da11db8 ("[SCSI] lpfc 8.3.27: T10 additions for SLI4")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c b/drivers/scsi/lpfc/lpfc_debugfs.c
index f1951c432766d1a2680e6611d0c1705c423bc6e6..2c70e311943ac72c5805b7f505e88a4eebfc36fc 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_debugfs.c
+++ b/drivers/scsi/lpfc/lpfc_debugfs.c
@@ -1843,7 +1843,7 @@ lpfc_debugfs_dif_err_write(struct file *file, const char __user *buf,
        memset(dstbuf, 0, 33);
        size = (nbytes < 32) ? nbytes : 32;
        if (copy_from_user(dstbuf, buf, size))
-               return 0;
+               return -EFAULT;
 
        if (dent == phba->debug_InjErrLBA) {
                if ((buf[0] == 'o') && (buf[1] == 'f') && (buf[2] == 'f'))
@@ -1851,7 +1851,7 @@ lpfc_debugfs_dif_err_write(struct file *file, const char __user *buf,
        }
 
        if ((tmp == 0) && (kstrtoull(dstbuf, 0, &tmp)))
-               return 0;
+               return -EINVAL;
 
        if (dent == phba->debug_writeGuard)
                phba->lpfc_injerr_wgrd_cnt = (uint32_t)tmp;