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cxgb4: fix signed wrap around when decrementing index idx 

Change predecrement compare to post decrement compare to avoid an
unsigned integer wrap-around comparison when decrementing idx in
the while loop.

For example, when idx is zero, the current situation will
predecrement idx in the while loop, wrapping idx to the maximum
signed integer and cause out of bounds reads on rxq_info->msix_tbl[idx].

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Colin Ian King 2016-09-22 18:48:58 +01:00 committed by David S. Miller
parent c7b9e63341
commit e12934d980
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c
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@ -367,7 +367,7 @@ int request_msix_queue_irqs_uld(struct adapter *adap, unsigned int uld_type)
}
return 0;
unwind:
while (--idx >= 0) {
while (idx-- > 0) {
bmap_idx = rxq_info->msix_tbl[idx];
free_msix_idx_in_bmap(adap, bmap_idx);
free_irq(adap->msix_info_ulds[bmap_idx].vec,