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[netdevice] Do not attempt to unmap a null I/O buffer

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netdev_tx_err() may be called with a null I/O buffer (e.g. to record a
transmit error with no associated buffer).  Avoid a potential null
pointer dereference in the DMA unmapping code path.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2020-11-29 11:21:20 +00:00
parent 8d337ecdae
commit 9ff61ab28d
1 changed files with 1 additions and 1 deletions
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2
src/net/netdevice.c
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@@ -392,7 +392,7 @@ void netdev_tx_err ( struct net_device *netdev,
} }
/* Unmap I/O buffer, if required */ /* Unmap I/O buffer, if required */
if ( dma_mapped ( &iobuf->map ) ) if ( iobuf && dma_mapped ( &iobuf->map ) )
iob_unmap ( iobuf ); iob_unmap ( iobuf );
/* Discard packet */ /* Discard packet */