[PATCH 3.18 21/47] wan: pc300too: abort path on failure

From: Greg Kroah-Hartman
Date: Fri Mar 23 2018 - 06:29:34 EST


3.18-stable review patch. If anyone has any objections, please let me know.

------------------

From: Pan Bian <bianpan2016@xxxxxxx>


[ Upstream commit 2a39e7aa8a98f777f0732ca7125b6c9668791760 ]

In function pc300_pci_init_one(), on the ioremap error path, function
pc300_pci_remove_one() is called to free the allocated memory. However,
the path is not terminated, and the freed memory will be used later,
resulting in use-after-free bugs. This path fixes the bug.

Signed-off-by: Pan Bian <bianpan2016@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wan/pc300too.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/net/wan/pc300too.c
+++ b/drivers/net/wan/pc300too.c
@@ -347,6 +347,7 @@ static int pc300_pci_init_one(struct pci
card->rambase == NULL) {
pr_err("ioremap() failed\n");
pc300_pci_remove_one(pdev);
+ return -ENOMEM;
}

/* PLX PCI 9050 workaround for local configuration register read bug */