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qed: potential overflow in qed_cxt_src_t2_alloc()

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In the current code "ent_per_page" could be more than "conn_num" making
"conn_num" negative after the subtraction.  In the next iteration
through the loop then the negative is treated as a very high positive
meaning we don't put a limit on "ent_num".  It could lead to memory
corruption.

Fixes: dbb799c39717 ('qed: Initialize hardware for new protocols')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2016-06-07 15:04:16 +03:00 committed by David S. Miller
parent f02ea21548
commit 01e517f16e
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/qlogic/qed/qed_cxt.c
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@ -850,7 +850,7 @@ static int qed_cxt_src_t2_alloc(struct qed_hwfn *p_hwfn)
val = 0;
entries[j].next = cpu_to_be64(val);
conn_num -= ent_per_page;
conn_num -= ent_num;
}
return 0;