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| author | Mike Qiu <qiudayu@linux.vnet.ibm.com> | 2014-04-15 00:12:35 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-04-15 00:12:35 +0200 |
| commit | ff0c41b2df1577f3354f788af4f6bb5dbdfd26da (patch) | |
| tree | 6cc7d886506931f27419040efd98e096508fb501 /drivers/pci/setup-irq.c | |
| parent | Linux 3.15-rc1 (diff) | |
| download | linux-ff0c41b2df1577f3354f788af4f6bb5dbdfd26da.tar.xz linux-ff0c41b2df1577f3354f788af4f6bb5dbdfd26da.zip | |
powerpc/PCI: Fix NULL dereference in sys_pciconfig_iobase() list traversal
3bc955987fb3 ("powerpc/PCI: Use list_for_each_entry() for bus traversal")
caused a NULL pointer dereference because the loop body set the iterator to
NULL:
Unable to handle kernel paging request for data at address 0x00000000
Faulting instruction address: 0xc000000000041d78
Oops: Kernel access of bad area, sig: 11 [#1]
...
NIP [c000000000041d78] .sys_pciconfig_iobase+0x68/0x1f0
LR [c000000000041e0c] .sys_pciconfig_iobase+0xfc/0x1f0
Call Trace:
[c0000003b4787db0] [c000000000041e0c] .sys_pciconfig_iobase+0xfc/0x1f0 (unreliable)
[c0000003b4787e30] [c000000000009ed8] syscall_exit+0x0/0x98
Fix it by using a temporary variable for the iterator.
[bhelgaas: changelog, drop tmp_bus initialization]
Fixes: 3bc955987fb3 powerpc/PCI: Use list_for_each_entry() for bus traversal
Signed-off-by: Mike Qiu <qiudayu@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/setup-irq.c')
0 files changed, 0 insertions, 0 deletions