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[S390] cio: fix potential overflow in chpid descriptor 

The length filed in the chsc response block (if valid)
has a value of n*(sizeof(chp_desc))+8 (for the response
block header). When we memcopied from the response block
to the actual descriptor we copied 8 bytes too much.
The bug was not revealed since the descriptor is embedded
in struct channel_path.
Since we only write one descriptor at a time ignore the
length value and use sizeof(*desc).

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2010-07-19 09:22:37 +02:00 committed by Martin Schwidefsky
parent 0abccf7740
commit 878c495644
1 changed files with 1 additions and 1 deletions
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2
drivers/s390/cio/chsc.c
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@ -713,7 +713,7 @@ int chsc_determine_base_channel_path_desc(struct chp_id chpid,
ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, chsc_resp);
if (ret)
goto out_free;
memcpy(desc, &chsc_resp->data, chsc_resp->length);
memcpy(desc, &chsc_resp->data, sizeof(*desc));
out_free:
kfree(chsc_resp);
return ret;