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authorLv Yunlong <lyl2019@mail.ustc.edu.cn>2021-04-26 20:06:20 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-07-20 17:16:07 +0300
commit481a76d4749ee3a27f902ba213fdcbb4bb39720e (patch)
treec8ff82068db1c0b751f99c9ede51d69c7cfa7af8
parent4d8421902085c0c373146417088f5ee6a15ad70a (diff)
downloadlinux-481a76d4749ee3a27f902ba213fdcbb4bb39720e.tar.xz
misc/libmasm/module: Fix two use after free in ibmasm_init_one
[ Upstream commit 7272b591c4cb9327c43443f67b8fbae7657dd9ae ] In ibmasm_init_one, it calls ibmasm_init_remote_input_dev(). Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are allocated by input_allocate_device(), and assigned to sp->remote.mouse_dev and sp->remote.keybd_dev respectively. In the err_free_devices error branch of ibmasm_init_one, mouse_dev and keybd_dev are freed by input_free_device(), and return error. Then the execution runs into error_send_message error branch of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev. My patch add a "error_init_remote" label to handle the error of ibmasm_init_remote_input_dev(), to avoid the uaf bugs. Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn> Link: https://lore.kernel.org/r/20210426170620.10546-1-lyl2019@mail.ustc.edu.cn Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r--drivers/misc/ibmasm/module.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/misc/ibmasm/module.c b/drivers/misc/ibmasm/module.c
index e914b8c80943..9f8344169845 100644
--- a/drivers/misc/ibmasm/module.c
+++ b/drivers/misc/ibmasm/module.c
@@ -125,7 +125,7 @@ static int ibmasm_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
result = ibmasm_init_remote_input_dev(sp);
if (result) {
dev_err(sp->dev, "Failed to initialize remote queue\n");
- goto error_send_message;
+ goto error_init_remote;
}
result = ibmasm_send_driver_vpd(sp);
@@ -145,8 +145,9 @@ static int ibmasm_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
return 0;
error_send_message:
- disable_sp_interrupts(sp->base_address);
ibmasm_free_remote_input_dev(sp);
+error_init_remote:
+ disable_sp_interrupts(sp->base_address);
free_irq(sp->irq, (void *)sp);
error_request_irq:
iounmap(sp->base_address);