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PCI: tegra194: Fix possible array out of bounds access

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[ Upstream commit 205b3d02d5 ]

Add check to fix the possible array out of bounds violation by
making speed equal to GEN1_CORE_CLK_FREQ when its value is more
than the size of "pcie_gen_freq" array. This array has size of
four but possible speed (CLS) values are from "0 to 0xF". So,
"speed - 1" values are "-1 to 0xE".

Suggested-by: Bjorn Helgaas <helgaas@kernel.org>
Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
Link: https://lore.kernel.org/lkml/72b9168b-d4d6-4312-32ea-69358df2f2d0@nvidia.com/
Acked-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sumit Gupta 2023-05-11 23:02:09 +05:30 • committed by Justin Hammond
parent 371033c5dc
commit da6c0f7371
1 changed files with 11 additions and 2 deletions
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13
drivers/pci/controller/dwc/pcie-tegra194.c
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@ -239,6 +239,7 @@
#define EP_STATE_ENABLED 1
static const unsigned int pcie_gen_freq[] = {
GEN1_CORE_CLK_FREQ, /* PCI_EXP_LNKSTA_CLS == 0; undefined */
GEN1_CORE_CLK_FREQ,
GEN2_CORE_CLK_FREQ,
GEN3_CORE_CLK_FREQ,
@ -452,7 +453,11 @@ static irqreturn_t tegra_pcie_ep_irq_thread(int irq, void *arg)
speed = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA) &
PCI_EXP_LNKSTA_CLS;
clk_set_rate(pcie->core_clk, pcie_gen_freq[speed - 1]);
if (speed >= ARRAY_SIZE(pcie_gen_freq))
speed = 0;
clk_set_rate(pcie->core_clk, pcie_gen_freq[speed]);
/* If EP doesn't advertise L1SS, just return */
val = dw_pcie_readl_dbi(pci, pcie->cfg_link_cap_l1sub);
@ -989,7 +994,11 @@ retry_link:
speed = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA) &
PCI_EXP_LNKSTA_CLS;
clk_set_rate(pcie->core_clk, pcie_gen_freq[speed - 1]);
if (speed >= ARRAY_SIZE(pcie_gen_freq))
speed = 0;
clk_set_rate(pcie->core_clk, pcie_gen_freq[speed]);
tegra_pcie_enable_interrupts(pp);