ata: libata: Fix memory leak for error path in ata_host_alloc()

commit 284b75a3d83c7631586d98f6dede1d90f128f0db upstream.

In ata_host_alloc(), if devres_alloc() fails to allocate the device host
resource data pointer, the already allocated ata_host structure is not
freed before returning from the function. This results in a potential
memory leak.

Call kfree(host) before jumping to the error handling path to ensure
that the ata_host structure is properly freed if devres_alloc() fails.

Fixes: 2623c7a5f279 ("libata: add refcounting to ata_host")
Cc: stable@vger.kernel.org
Signed-off-by: Zheng Qixing <zhengqixing@huawei.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 373d23af1d9acf1c1d3061c3dc135b2c960d73ec..4ed90d46a017a8da161b6636f1840b3a0fb149dd 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5593,8 +5593,10 @@ struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
        }
 
        dr = devres_alloc(ata_devres_release, 0, GFP_KERNEL);
-       if (!dr)
+       if (!dr) {
+               kfree(host);
                goto err_out;
+       }
 
        devres_add(dev, dr);
        dev_set_drvdata(dev, host);