diff options
| author | Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com> | 2026-04-07 18:14:21 +0530 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2026-06-22 15:31:10 -0500 |
| commit | d1db6d7c2485ee475a04d8354fbb5b26ea10d978 (patch) | |
| tree | 2f679121f71919e7bfefc22b88f811acf34ea0a9 | |
| parent | 33bd1ea748bc897c4d13437284e08c658e8d1340 (diff) | |
PCI: endpoint: pci-epf-ntb: Add check to detect 'db_count' value of 0
epf_ntb->db_count value should be within 1 to MAX_DB_COUNT. Current code
only checks for the upper bound, while the lower bound is unchecked. This
can cause a lot of issues in the driver if the user passes 'db_count' as 0.
Add a check for 0 also. While at it, remove the redundant 'db_count'
variable from epf_ntb_configure_interrupt().
Fixes: 8b821cf76150 ("PCI: endpoint: Add EP function driver to provide NTB functionality")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260407124421.282766-3-mani@kernel.org
| -rw-r--r-- | drivers/pci/endpoint/functions/pci-epf-ntb.c | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/drivers/pci/endpoint/functions/pci-epf-ntb.c b/drivers/pci/endpoint/functions/pci-epf-ntb.c index 2bdcc35b652c..5314aca2188a 100644 --- a/drivers/pci/endpoint/functions/pci-epf-ntb.c +++ b/drivers/pci/endpoint/functions/pci-epf-ntb.c @@ -559,12 +559,15 @@ static int epf_ntb_configure_db(struct epf_ntb *ntb, struct pci_epc *epc; int ret; - if (db_count > MAX_DB_COUNT) - return -EINVAL; - ntb_epc = ntb->epc[type]; epc = ntb_epc->epc; + if (!db_count || db_count > MAX_DB_COUNT) { + dev_err(&epc->dev, "DB count %d out of range (1 - %d)\n", + db_count, MAX_DB_COUNT); + return -EINVAL; + } + if (msix) ret = epf_ntb_configure_msix(ntb, type, db_count); else @@ -1278,7 +1281,6 @@ static int epf_ntb_configure_interrupt(struct epf_ntb *ntb, u8 func_no, vfunc_no; struct pci_epc *epc; struct device *dev; - u32 db_count; int ret; ntb_epc = ntb->epc[type]; @@ -1296,17 +1298,16 @@ static int epf_ntb_configure_interrupt(struct epf_ntb *ntb, func_no = ntb_epc->func_no; vfunc_no = ntb_epc->vfunc_no; - db_count = ntb->db_count; - if (db_count > MAX_DB_COUNT) { - dev_err(dev, "DB count cannot be more than %d\n", MAX_DB_COUNT); + if (!ntb->db_count || ntb->db_count > MAX_DB_COUNT) { + dev_err(dev, "DB count %d out of range (1 - %d)\n", + ntb->db_count, MAX_DB_COUNT); return -EINVAL; } - ntb->db_count = db_count; epc = ntb_epc->epc; if (msi_capable) { - ret = pci_epc_set_msi(epc, func_no, vfunc_no, db_count); + ret = pci_epc_set_msi(epc, func_no, vfunc_no, ntb->db_count); if (ret) { dev_err(dev, "%s intf: MSI configuration failed\n", pci_epc_interface_string(type)); @@ -1315,7 +1316,7 @@ static int epf_ntb_configure_interrupt(struct epf_ntb *ntb, } if (msix_capable) { - ret = pci_epc_set_msix(epc, func_no, vfunc_no, db_count, + ret = pci_epc_set_msix(epc, func_no, vfunc_no, ntb->db_count, ntb_epc->msix_bar, ntb_epc->msix_table_offset); if (ret) { |