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drivers: ixgbevf: fix unsigned underflow

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'count' is unsigned. It is initialized to zero, then it can be increased
multiple times, and finally it is used in such a way:

   >>>> count--;
   |
   |    /* clear timestamp and dma mappings for remaining portion of packet */
   |    while (count >= 0) {
   |            count--;
   |            ...
   ^
If count is zero here (so, it was never increased), we would have a very
long loop :)

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kulikov Vasiliy 2010-07-15 08:45:57 +00:00 committed by David S. Miller
parent 9f27fb8514
commit 2540ddb512
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ixgbevf/ixgbevf_main.c
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@ -2935,7 +2935,8 @@ static int ixgbevf_tx_map(struct ixgbevf_adapter *adapter,
struct ixgbevf_tx_buffer *tx_buffer_info;
unsigned int len;
unsigned int total = skb->len;
unsigned int offset = 0, size, count = 0;
unsigned int offset = 0, size;
int count = 0;
unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
unsigned int f;
int i;