ath10k: do not return invalid pointers as a *dentry

When calling debugfs functions, they can now return error values if
something went wrong.  If that happens, return a NULL as a *dentry to
the relay core instead of passing it an illegal pointer.

The relay core should be able to handle an illegal pointer, but add this
check to be safe.

Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: ath10k@lists.infradead.org
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/ath/ath10k/spectral.c b/drivers/net/wireless/ath/ath10k/spectral.c
index 653b6d01320773323affbb23ee17eabf11038ae7..4a7fa3e4e99f9677b43bb74b6536290894fe515f 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/spectral.c
+++ b/drivers/net/wireless/ath/ath10k/spectral.c
@@ -494,6 +494,9 @@ static struct dentry *create_buf_file_handler(const char *filename,
 
        buf_file = debugfs_create_file(filename, mode, parent, buf,
                                       &relay_file_operations);
+       if (IS_ERR(buf_file))
+               return NULL;
+
        *is_global = 1;
        return buf_file;
 }