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PCI/sysfs: Return -EINVAL consistently from "store" functions

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Most of the "store" functions that handle userspace input via sysfs return
-EINVAL should the value fail validation and/or type conversion.  This
error code is a clear message to userspace that the value is not a valid
input.

However, some of the "show" functions return input parsing error codes
as-is, which may be either -EINVAL or -ERANGE.  The former would often be
from kstrtobool(), and the latter typically from other kstr*() functions
such as kstrtou8(), kstrtou32(), kstrtoint(), etc.

-EINVAL is commonly returned as the error code to indicate that the value
provided is invalid, but -ERANGE is not very useful in userspace.

Therefore, normalize the return error code to be -EINVAL for when the
validation and/or type conversion fails.

Link: https://lore.kernel.org/r/20210915230127.2495723-2-kw@linux.com
Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Krzysztof Wilczyński 2021-09-15 23:01:26 +00:00 committed by Bjorn Helgaas
parent 95e83e219d
commit 36f354ec7b
4 changed files with 33 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/pci/endpoint/functions/pci-epf-ntb.c
View File

@ -1947,11 +1947,9 @@ static ssize_t epf_ntb_##_name##_store(struct config_item *item, \
struct config_group *group = to_config_group(item); \
struct epf_ntb *ntb = to_epf_ntb(group); \
u32 val; \
int ret; \
\
ret = kstrtou32(page, 0, &val); \
if (ret) \
return ret; \
if (kstrtou32(page, 0, &val) < 0) \
return -EINVAL; \
\
ntb->_name = val; \
\
@ -1980,11 +1978,9 @@ static ssize_t epf_ntb_##_name##_store(struct config_item *item, \
struct device *dev = &ntb->epf->dev; \
int win_no; \
u64 val; \
int ret; \
\
ret = kstrtou64(page, 0, &val); \
if (ret) \
return ret; \
if (kstrtou64(page, 0, &val) < 0) \
return -EINVAL; \
\
if (sscanf(#_name, "mw%d", &win_no) != 1) \
return -EINVAL; \
@ -2005,11 +2001,9 @@ static ssize_t epf_ntb_num_mws_store(struct config_item *item,
struct config_group *group = to_config_group(item);
struct epf_ntb *ntb = to_epf_ntb(group);
u32 val;
int ret;
ret = kstrtou32(page, 0, &val);
if (ret)
return ret;
if (kstrtou32(page, 0, &val) < 0)
return -EINVAL;
if (val > MAX_MW)
return -EINVAL;

35
drivers/pci/endpoint/pci-ep-cfs.c
View File

@ -175,9 +175,8 @@ static ssize_t pci_epc_start_store(struct config_item *item, const char *page,
epc = epc_group->epc;
ret = kstrtobool(page, &start);
if (ret)
return ret;
if (kstrtobool(page, &start) < 0)
return -EINVAL;
if (!start) {
pci_epc_stop(epc);
@ -329,13 +328,11 @@ static ssize_t pci_epf_##_name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
u32 val; \
int ret; \
struct pci_epf *epf = to_pci_epf_group(item)->epf; \
if (WARN_ON_ONCE(!epf->header)) \
return -EINVAL; \
ret = kstrtou32(page, 0, &val); \
if (ret) \
return ret; \
if (kstrtou32(page, 0, &val) < 0) \
return -EINVAL; \
epf->header->_name = val; \
return len; \
}
@ -345,13 +342,11 @@ static ssize_t pci_epf_##_name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
u16 val; \
int ret; \
struct pci_epf *epf = to_pci_epf_group(item)->epf; \
if (WARN_ON_ONCE(!epf->header)) \
return -EINVAL; \
ret = kstrtou16(page, 0, &val); \
if (ret) \
return ret; \
if (kstrtou16(page, 0, &val) < 0) \
return -EINVAL; \
epf->header->_name = val; \
return len; \
}
@ -361,13 +356,11 @@ static ssize_t pci_epf_##_name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
u8 val; \
int ret; \
struct pci_epf *epf = to_pci_epf_group(item)->epf; \
if (WARN_ON_ONCE(!epf->header)) \
return -EINVAL; \
ret = kstrtou8(page, 0, &val); \
if (ret) \
return ret; \
if (kstrtou8(page, 0, &val) < 0) \
return -EINVAL; \
epf->header->_name = val; \
return len; \
}
@ -376,11 +369,9 @@ static ssize_t pci_epf_msi_interrupts_store(struct config_item *item,
const char *page, size_t len)
{
u8 val;
int ret;
ret = kstrtou8(page, 0, &val);
if (ret)
return ret;
if (kstrtou8(page, 0, &val) < 0)
return -EINVAL;
to_pci_epf_group(item)->epf->msi_interrupts = val;
@ -398,11 +389,9 @@ static ssize_t pci_epf_msix_interrupts_store(struct config_item *item,
const char *page, size_t len)
{
u16 val;
int ret;
ret = kstrtou16(page, 0, &val);
if (ret)
return ret;
if (kstrtou16(page, 0, &val) < 0)
return -EINVAL;
to_pci_epf_group(item)->epf->msix_interrupts = val;

14
drivers/pci/iov.c
View File

@ -183,11 +183,10 @@ static ssize_t sriov_vf_msix_count_store(struct device *dev,
{
struct pci_dev *vf_dev = to_pci_dev(dev);
struct pci_dev *pdev = pci_physfn(vf_dev);
int val, ret;
int val, ret = 0;
ret = kstrtoint(buf, 0, &val);
if (ret)
return ret;
if (kstrtoint(buf, 0, &val) < 0)
return -EINVAL;
if (val < 0)
return -EINVAL;
@ -376,12 +375,11 @@ static ssize_t sriov_numvfs_store(struct device *dev,
const char *buf, size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
int ret;
int ret = 0;
u16 num_vfs;
ret = kstrtou16(buf, 0, &num_vfs);
if (ret < 0)
return ret;
if (kstrtou16(buf, 0, &num_vfs) < 0)
return -EINVAL;
if (num_vfs > pci_sriov_get_totalvfs(pdev))
return -ERANGE;

20
drivers/pci/pci-sysfs.c
View File

@ -273,15 +273,14 @@ static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
{
struct pci_dev *pdev = to_pci_dev(dev);
unsigned long val;
ssize_t result;
ssize_t result = 0;
/* this can crash the machine when done on the "wrong" device */
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
result = kstrtoul(buf, 0, &val);
if (result < 0)
return result;
if (kstrtoul(buf, 0, &val) < 0)
return -EINVAL;
device_lock(dev);
if (dev->driver)
@ -313,14 +312,13 @@ static ssize_t numa_node_store(struct device *dev,
size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
int node, ret;
int node;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
ret = kstrtoint(buf, 0, &node);
if (ret)
return ret;
if (kstrtoint(buf, 0, &node) < 0)
return -EINVAL;
if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
return -EINVAL;
@ -1340,10 +1338,10 @@ static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
{
struct pci_dev *pdev = to_pci_dev(dev);
unsigned long val;
ssize_t result = kstrtoul(buf, 0, &val);
ssize_t result;
if (result < 0)
return result;
if (kstrtoul(buf, 0, &val) < 0)
return -EINVAL;
if (val != 1)
return -EINVAL;