[PATCH 5.4 58/71] ethernet: sun: niu: fix missing checks of niu_pci_eeprom_read()

Greg Kroah-Hartman
2021-05-24T15:56:20Z

From: Du Cheng <ducheng2@gmail.com>

commit e6e337708c22f80824b82d4af645f20715730ad0 upstream.

niu_pci_eeprom_read() may fail, so add checks to its return value and
propagate the error up the callstack.

An examination of the callstack up to niu_pci_eeprom_read shows that:

niu_pci_eeprom_read() // returns int
niu_pci_vpd_scan_props() // returns int
niu_pci_vpd_fetch() // returns *void*
niu_get_invariants() // returns int

since niu_pci_vpd_fetch() returns void which breaks the bubbling up,
change its return type to int so that error is propagated upwards.

Signed-off-by: Du Cheng <ducheng2@gmail.com>
Cc: Shannon Nelson <shannon.lee.nelson@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210503115736.2104747-24-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/sun/niu.c | 34 ++++++++++++++++++++++++----------
1 file changed, 24 insertions(+), 10 deletions(-)

--- a/drivers/net/ethernet/sun/niu.c
+++ b/drivers/net/ethernet/sun/niu.c
@@ -8097,6 +8097,8 @@ static int niu_pci_vpd_scan_props(struct
start += 3;

prop_len = niu_pci_eeprom_read(np, start + 4);
+ if (prop_len < 0)
+ return prop_len;
err = niu_pci_vpd_get_propname(np, start + 5, namebuf, 64);
if (err < 0)
return err;
@@ -8141,8 +8143,12 @@ static int niu_pci_vpd_scan_props(struct
netif_printk(np, probe, KERN_DEBUG, np->dev,
"VPD_SCAN: Reading in property [%s] len[%d]\n",
namebuf, prop_len);
- for (i = 0; i < prop_len; i++)
- *prop_buf++ = niu_pci_eeprom_read(np, off + i);
+ for (i = 0; i < prop_len; i++) {
+ err = niu_pci_eeprom_read(np, off + i);
+ if (err < 0)
+ return err;
+ *prop_buf++ = err;
+ }
}

start += len;
@@ -8152,14 +8158,14 @@ static int niu_pci_vpd_scan_props(struct
}

/* ESPC_PIO_EN_ENABLE must be set */
-static void niu_pci_vpd_fetch(struct niu *np, u32 start)
+static int niu_pci_vpd_fetch(struct niu *np, u32 start)
{
u32 offset;
int err;

err = niu_pci_eeprom_read16_swp(np, start + 1);
if (err < 0)
- return;
+ return err;

offset = err + 3;

@@ -8168,12 +8174,14 @@ static void niu_pci_vpd_fetch(struct niu
u32 end;

err = niu_pci_eeprom_read(np, here);
+ if (err < 0)
+ return err;
if (err != 0x90)
- return;
+ return -EINVAL;

err = niu_pci_eeprom_read16_swp(np, here + 1);
if (err < 0)
- return;
+ return err;

here = start + offset + 3;
end = start + offset + err;
@@ -8181,9 +8189,12 @@ static void niu_pci_vpd_fetch(struct niu
offset += err;

err = niu_pci_vpd_scan_props(np, here, end);
- if (err < 0 || err == 1)
- return;
+ if (err < 0)
+ return err;
+ if (err == 1)
+ return -EINVAL;
}
+ return 0;
}

/* ESPC_PIO_EN_ENABLE must be set */
@@ -9274,8 +9285,11 @@ static int niu_get_invariants(struct niu
offset = niu_pci_vpd_offset(np);
netif_printk(np, probe, KERN_DEBUG, np->dev,
"%s() VPD offset [%08x]\n", __func__, offset);
- if (offset)
- niu_pci_vpd_fetch(np, offset);
+ if (offset) {
+ err = niu_pci_vpd_fetch(np, offset);
+ if (err < 0)
+ return err;
+ }
nw64(ESPC_PIO_EN, 0);

if (np->flags & NIU_FLAGS_VPD_VALID) {