pch_phub: return -ENODATA if ROM can't be mapped

commit a75fa128236bc2fdaa5e412145cbd577e42e14c2 upstream.

The error return err is not initialized for the case when pci_map_rom
fails and no ROM can me mapped.  Fix this by setting ret to -ENODATA;
(this is the same error value that is returned if the ROM data is
successfully mapped but does not match the expected ROM signature.).

Issue found from static code analysis using CoverityScan.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/misc/pch_phub.c b/drivers/misc/pch_phub.c
index a5925f7f17f6a564cab6296dd2333fb5ae08d92e..829ca77c143effc45b431ba8e44546a94e5d296b 100644 (file)
--- a/drivers/misc/pch_phub.c
+++ b/drivers/misc/pch_phub.c
@@ -512,8 +512,10 @@ static ssize_t pch_phub_bin_read(struct file *filp, struct kobject *kobj,
 
        /* Get Rom signature */
        chip->pch_phub_extrom_base_address = pci_map_rom(chip->pdev, &rom_size);
-       if (!chip->pch_phub_extrom_base_address)
+       if (!chip->pch_phub_extrom_base_address) {
+               err = -ENODATA;
                goto exrom_map_err;
+       }
 
        pch_phub_read_serial_rom(chip, chip->pch_opt_rom_start_address,
                                (unsigned char *)&rom_signature);