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ipack/carriers/tpci200: Fix a double free in tpci200_pci_probe 

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: cea2f7cdff ("Staging: ipack/bridges/tpci200: Use the TPCI200 in big endian mode")
Cc: stable <stable@vger.kernel.org>
Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Link: https://lore.kernel.org/r/20210524093205.8333-1-lyl2019@mail.ustc.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lv Yunlong 2021-05-24 02:32:05 -07:00 committed by Greg Kroah-Hartman
parent 8489ebfac3
commit 4e78a2a4fc
1 changed files with 4 additions and 1 deletions
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5
drivers/ipack/carriers/tpci200.c
View File

@ -596,8 +596,11 @@ static int tpci200_pci_probe(struct pci_dev *pdev,
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: