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HID: core: fix NULL pointer dereference 

There is a NULL pointer dereference in case memory resources
for *parse* are not successfully allocated.

Fix this by adding a new goto label and make the execution
path jump to it in case vzalloc() fails.

Addresses-Coverity-ID: 1473081 ("Dereference after null check")
Fixes: b2dd9f2e5a ("HID: core: fix memory leak on probe")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Gustavo A. R. Silva 2018-08-29 10:22:09 -05:00 committed by Jiri Kosina
parent 0d6c301140
commit b034ed50a2
1 changed files with 2 additions and 1 deletions
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3
drivers/hid/hid-core.c
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@ -1000,7 +1000,7 @@ int hid_open_report(struct hid_device *device)
parser = vzalloc(sizeof(struct hid_parser));
if (!parser) {
ret = -ENOMEM;
goto err;
goto alloc_err;
}
parser->device = device;
@ -1049,6 +1049,7 @@ int hid_open_report(struct hid_device *device)
hid_err(device, "item fetching failed at offset %d\n", (int)(end - start));
err:
kfree(parser->collection_stack);
alloc_err:
vfree(parser);
hid_close_report(device);
return ret;