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staging: gasket: Fix mapping refcnt leak when put attribute fails

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gasket_sysfs_put_attr() invokes get_mapping(), which returns a reference
of the specified gasket_sysfs_mapping object to "mapping" with increased
refcnt.

When gasket_sysfs_put_attr() returns, local variable "mapping" becomes
invalid, so the refcount should be decreased to keep refcount balanced.

The reference counting issue happens in one path of
gasket_sysfs_put_attr(). When mapping attribute is unknown, the function
forgets to decrease the refcnt increased by get_mapping(), causing a
refcnt leak.

Fix this issue by calling put_mapping() when put attribute fails due to
unknown attribute.

Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Link: https://lore.kernel.org/r/1587618895-13660-1-git-send-email-xiyuyang19@fudan.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xiyu Yang 2020-04-23 13:14:55 +08:00 committed by Greg Kroah-Hartman
parent 5975b85ae2
commit 57a66838e1
1 changed files with 1 additions and 0 deletions
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drivers/staging/gasket/gasket_sysfs.c
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@ -340,6 +340,7 @@ void gasket_sysfs_put_attr(struct device *device,
dev_err(device, "Unable to put unknown attribute: %s\n",
attr->attr.attr.name);
put_mapping(mapping);
}
EXPORT_SYMBOL(gasket_sysfs_put_attr);