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ide: serverworks: potential overflow in svwks_set_pio_mode()

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[ Upstream commit ce1f31b4c0b9551dd51874dd5364654ed4ca13ae ]

The "drive->dn" variable is a u8 controlled by root.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2020-01-07 16:06:07 +03:00 committed by Greg Kroah-Hartman
parent 60bea48fd4
commit 1cbed63d13
1 changed files with 6 additions and 0 deletions
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6
drivers/ide/serverworks.c
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@ -114,6 +114,9 @@ static void svwks_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
struct pci_dev *dev = to_pci_dev(hwif->dev);
const u8 pio = drive->pio_mode - XFER_PIO_0;
if (drive->dn >= ARRAY_SIZE(drive_pci))
return;
pci_write_config_byte(dev, drive_pci[drive->dn], pio_modes[pio]);
if (svwks_csb_check(dev)) {
@ -140,6 +143,9 @@ static void svwks_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
u8 ultra_enable = 0, ultra_timing = 0, dma_timing = 0;
if (drive->dn >= ARRAY_SIZE(drive_pci2))
return;
pci_read_config_byte(dev, (0x56|hwif->channel), &ultra_timing);
pci_read_config_byte(dev, 0x54, &ultra_enable);