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bnxt_en: Fix NULL pointer dereference at bnxt_free_irq(). 

When open fails during ethtool -L ring change, for example, the driver
may crash at bnxt_free_irq() because bp->bnapi is NULL.

If we fail to allocate all the new rings, bnxt_open_nic() will free
all the memory including bp->bnapi.  Subsequent call to bnxt_close_nic()
will try to dereference bp->bnapi in bnxt_free_irq().

Fix it by checking for !bp->bnapi in bnxt_free_irq().

Fixes: e5811b8c09 ("bnxt_en: Add IRQ remapping logic.")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2018-04-11 11:50:18 -04:00 committed by David S. Miller
parent 11c3ec7bb9
commit cb98526bf9
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/broadcom/bnxt/bnxt.c
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@ -6090,7 +6090,7 @@ static void bnxt_free_irq(struct bnxt *bp)
free_irq_cpu_rmap(bp->dev->rx_cpu_rmap); free_irq_cpu_rmap(bp->dev->rx_cpu_rmap);
bp->dev->rx_cpu_rmap = NULL; bp->dev->rx_cpu_rmap = NULL;
#endif #endif
if (!bp->irq_tbl) if (!bp->irq_tbl || !bp->bnapi)
return; return;
for (i = 0; i < bp->cp_nr_rings; i++) { for (i = 0; i < bp->cp_nr_rings; i++) {