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tty: n_gsm: improper skb_pull() use was leaking framed data

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gsm_dlci_data_output_framed() was doing:
memcpy(dp, skb_pull(dlci->skb, len), len);

The problem is skb_pull() returns the post-increment data ptr
so the first chunk of dlci->skb->data is leaked.

Signed-off-by: Russ Gorby <russ.gorby@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Russ Gorby 2011-06-14 13:23:29 -07:00 committed by Greg Kroah-Hartman
parent 7263287af9
commit 57f2104f39
1 changed files with 2 additions and 1 deletions
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3
drivers/tty/n_gsm.c
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@ -875,7 +875,8 @@ static int gsm_dlci_data_output_framed(struct gsm_mux *gsm,
*dp++ = last << 7 | first << 6 | 1; /* EA */
len--;
}
memcpy(dp, skb_pull(dlci->skb, len), len);
memcpy(dp, dlci->skb->data, len);
skb_pull(dlci->skb, len);
__gsm_data_queue(dlci, msg);
if (last)
dlci->skb = NULL;