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ethernet: sun: niu: fix missing checks of niu_pci_eeprom_read()

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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>
This commit is contained in:
Du Cheng 2021-05-03 13:56:50 +02:00 committed by Greg Kroah-Hartman
parent 7930742d6a
commit e6e337708c
1 changed files with 24 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/net/ethernet/sun/niu.c
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@ -8097,6 +8097,8 @@ static int niu_pci_vpd_scan_props(struct niu *np, u32 start, u32 end)
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 niu *np, u32 start, u32 end)
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 niu *np, u32 start, u32 end)
}
/* 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 *np, u32 start)
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 *np, u32 start)
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 *np)
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) {