[PATCH 5.4 107/122] ipack/carriers/tpci200: Fix a double free in tpci200_pci_probe

From: Greg Kroah-Hartman
Date: Thu Jul 15 2021 - 14:47:33 EST


From: Lv Yunlong <lyl2019@xxxxxxxxxxxxxxxx>

commit 9272e5d0028d45a3b45b58c9255e6e0df53f7ad9 upstream.

In the out_err_bus_register error branch of tpci200_pci_probe,
tpci200->info->cfg_regs is freed by tpci200_uninstall()->
tpci200_unregister()->pci_iounmap(..,tpci200->info->cfg_regs)
in the first time.

But later, iounmap() is called to free tpci200->info->cfg_regs
again.

My patch sets tpci200->info->cfg_regs to NULL after tpci200_uninstall()
to avoid the double free.

Fixes: cea2f7cdff2af ("Staging: ipack/bridges/tpci200: Use the TPCI200 in big endian mode")
Cc: stable <stable@xxxxxxxxxxxxxxx>
Acked-by: Samuel Iglesias Gonsalvez <siglesias@xxxxxxxxxx>
Signed-off-by: Lv Yunlong <lyl2019@xxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210524093205.8333-1-lyl2019@xxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/ipack/carriers/tpci200.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/ipack/carriers/tpci200.c
+++ b/drivers/ipack/carriers/tpci200.c
@@ -596,8 +596,11 @@ static int tpci200_pci_probe(struct pci_

out_err_bus_register:
tpci200_uninstall(tpci200);
+ /* tpci200->info->cfg_regs is unmapped in tpci200_uninstall */
+ tpci200->info->cfg_regs = NULL;
out_err_install:
- iounmap(tpci200->info->cfg_regs);
+ if (tpci200->info->cfg_regs)
+ iounmap(tpci200->info->cfg_regs);
out_err_ioremap:
pci_release_region(pdev, TPCI200_CFG_MEM_BAR);
out_err_pci_request: