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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2020-01-07 16:06:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-24 08:36:53 +0100 |
| commit | adf4ab6d831271c04506af47b081c0a298a8d551 (patch) | |
| tree | 58d9dcbc1c8026137814347439acf86c59d313d2 /drivers/ide/serverworks.c | |
| parent | e5c8d3abd927c6d15b261845f898d9ded665e44f (diff) | |
| download | linux-stable-adf4ab6d831271c04506af47b081c0a298a8d551.tar.gz linux-stable-adf4ab6d831271c04506af47b081c0a298a8d551.tar.bz2 linux-stable-adf4ab6d831271c04506af47b081c0a298a8d551.zip | |
ide: serverworks: potential overflow in svwks_set_pio_mode()
[ 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>
Diffstat (limited to 'drivers/ide/serverworks.c')
| -rw-r--r-- | drivers/ide/serverworks.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/ide/serverworks.c b/drivers/ide/serverworks.c index ac6fc3fffa0d..458e72e034b0 100644 --- a/drivers/ide/serverworks.c +++ b/drivers/ide/serverworks.c @@ -115,6 +115,9 @@ 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)) { @@ -141,6 +144,9 @@ 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); |