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authorJulia Lawall <julia@diku.dk>2010-03-29 22:33:28 -0700
committerDavid S. Miller <davem@davemloft.net>2010-03-29 22:33:28 -0700
commitc4a3987fa075b2d15ebc3d59b01fb7ed403cd3e1 (patch)
treeb751350fb5c0abc2c8f636dae7429d409300be7f
parent9e8307ecaf9f8c8b5b3b22145021204c4e73114a (diff)
downloadop-kernel-dev-c4a3987fa075b2d15ebc3d59b01fb7ed403cd3e1.zip
op-kernel-dev-c4a3987fa075b2d15ebc3d59b01fb7ed403cd3e1.tar.gz
drivers/serial/sunsu.c: Correct use after free
The of_iounmap is at the out_unmap label, but at that point up has already been freed. The free cannot be moved to the out_unmap label, because that label is reachable from cases where up should not be freed. So the call to of_iounmap is just duplicated, and the goto converted to a return. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression x,e; identifier f; iterator I; statement S; @@ *kfree(x); ... when != &x when != x = e when != I(x,...) S *x->f // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/serial/sunsu.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/serial/sunsu.c b/drivers/serial/sunsu.c
index 170d3d6..cbcfb18 100644
--- a/drivers/serial/sunsu.c
+++ b/drivers/serial/sunsu.c
@@ -1453,8 +1453,10 @@ static int __devinit su_probe(struct of_device *op, const struct of_device_id *m
if (up->su_type == SU_PORT_KBD || up->su_type == SU_PORT_MS) {
err = sunsu_kbd_ms_init(up);
if (err) {
+ of_iounmap(&op->resource[0],
+ up->port.membase, up->reg_size);
kfree(up);
- goto out_unmap;
+ return err;
}
dev_set_drvdata(&op->dev, up);
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