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PCI/VPD: Use pci_read_vpd_any() in pci_vpd_size() 

Use new function pci_read_vpd_any() to simplify the code.

[bhelgaas: squash in fix for stack overflow reported & tested by
Qian [1] and Kunihiko [2]:
[1] https://lore.kernel.org/netdev/e89087c5-c495-c5ca-feb1-54cf3a8775c5@quicinc.com/
[2] https://lore.kernel.org/r/2f7e3770-ab47-42b5-719c-f7c661c07d28@socionext.com
Link: https://lore.kernel.org/r/6211be8a-5d10-8f3a-6d33-af695dc35caf@gmail.com
Reported-by: Qian Cai <quic_qiancai@quicinc.com>
Tested-by: Qian Cai <quic_qiancai@quicinc.com>
Reported-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Tested-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
]

Link: https://lore.kernel.org/r/049fa71c-c7af-9c69-51c0-05c1bc2bf660@gmail.com
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Heiner Kallweit 2021-09-10 08:22:49 +02:00 committed by Bjorn Helgaas
parent bf2928c7a2
commit 3331325c63
1 changed files with 13 additions and 12 deletions
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25
drivers/pci/vpd.c
View File

@ -57,10 +57,7 @@ static size_t pci_vpd_size(struct pci_dev *dev)
size_t off = 0, size; size_t off = 0, size;
unsigned char tag, header[1+2]; /* 1 byte tag, 2 bytes length */ unsigned char tag, header[1+2]; /* 1 byte tag, 2 bytes length */
/* Otherwise the following reads would fail. */ while (pci_read_vpd_any(dev, off, 1, header) == 1) {
dev->vpd.len = PCI_VPD_MAX_SIZE;
while (pci_read_vpd(dev, off, 1, header) == 1) {
size = 0; size = 0;
if (off == 0 && (header[0] == 0x00 || header[0] == 0xff)) if (off == 0 && (header[0] == 0x00 || header[0] == 0xff))
@ -68,7 +65,7 @@ static size_t pci_vpd_size(struct pci_dev *dev)
if (header[0] & PCI_VPD_LRDT) { if (header[0] & PCI_VPD_LRDT) {
/* Large Resource Data Type Tag */ /* Large Resource Data Type Tag */
if (pci_read_vpd(dev, off + 1, 2, &header[1]) != 2) { if (pci_read_vpd_any(dev, off + 1, 2, &header[1]) != 2) {
pci_warn(dev, "failed VPD read at offset %zu\n", pci_warn(dev, "failed VPD read at offset %zu\n",
off + 1); off + 1);
return off ?: PCI_VPD_SZ_INVALID; return off ?: PCI_VPD_SZ_INVALID;
@ -99,14 +96,14 @@ error:
return off ?: PCI_VPD_SZ_INVALID; return off ?: PCI_VPD_SZ_INVALID;
} }
static bool pci_vpd_available(struct pci_dev *dev) static bool pci_vpd_available(struct pci_dev *dev, bool check_size)
{ {
struct pci_vpd *vpd = &dev->vpd; struct pci_vpd *vpd = &dev->vpd;
if (!vpd->cap) if (!vpd->cap)
return false; return false;
if (vpd->len == 0) { if (vpd->len == 0 && check_size) {
vpd->len = pci_vpd_size(dev); vpd->len = pci_vpd_size(dev);
if (vpd->len == PCI_VPD_SZ_INVALID) { if (vpd->len == PCI_VPD_SZ_INVALID) {
vpd->cap = 0; vpd->cap = 0;
@ -159,17 +156,19 @@ static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count,
void *arg, bool check_size) void *arg, bool check_size)
{ {
struct pci_vpd *vpd = &dev->vpd; struct pci_vpd *vpd = &dev->vpd;
unsigned int max_len = check_size ? vpd->len : PCI_VPD_MAX_SIZE; unsigned int max_len;
int ret = 0; int ret = 0;
loff_t end = pos + count; loff_t end = pos + count;
u8 *buf = arg; u8 *buf = arg;
if (!pci_vpd_available(dev)) if (!pci_vpd_available(dev, check_size))
return -ENODEV; return -ENODEV;
if (pos < 0) if (pos < 0)
return -EINVAL; return -EINVAL;
max_len = check_size ? vpd->len : PCI_VPD_MAX_SIZE;
if (pos >= max_len) if (pos >= max_len)
return 0; return 0;
@ -221,17 +220,19 @@ static ssize_t pci_vpd_write(struct pci_dev *dev, loff_t pos, size_t count,
const void *arg, bool check_size) const void *arg, bool check_size)
{ {
struct pci_vpd *vpd = &dev->vpd; struct pci_vpd *vpd = &dev->vpd;
unsigned int max_len = check_size ? vpd->len : PCI_VPD_MAX_SIZE; unsigned int max_len;
const u8 *buf = arg; const u8 *buf = arg;
loff_t end = pos + count; loff_t end = pos + count;
int ret = 0; int ret = 0;
if (!pci_vpd_available(dev)) if (!pci_vpd_available(dev, check_size))
return -ENODEV; return -ENODEV;
if (pos < 0 || (pos & 3) || (count & 3)) if (pos < 0 || (pos & 3) || (count & 3))
return -EINVAL; return -EINVAL;
max_len = check_size ? vpd->len : PCI_VPD_MAX_SIZE;
if (end > max_len) if (end > max_len)
return -EINVAL; return -EINVAL;
@ -315,7 +316,7 @@ void *pci_vpd_alloc(struct pci_dev *dev, unsigned int *size)
void *buf; void *buf;
int cnt; int cnt;
if (!pci_vpd_available(dev)) if (!pci_vpd_available(dev, true))
return ERR_PTR(-ENODEV); return ERR_PTR(-ENODEV);
len = dev->vpd.len; len = dev->vpd.len;