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Date: Tue, 3 Mar 2020 18:43:14 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Pavel Belous <pbelous@...vell.com>, Igor Russkikh <irusskikh@...vell.com>, Dmitry Bogdanov <dbogdanov@...vell.com>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH 5.5 130/176] net: atlantic: fix potential error handling From: Pavel Belous <pbelous@...vell.com> commit 380ec5b9af7f0d57dbf6ac067fd9f33cff2fef71 upstream. Code inspection found that in case of mapping error we do return current 'ret' value. But beside error, it is used to count number of descriptors allocated for the packet. In that case map_skb function could return '1'. Changing it to return zero (number of mapped descriptors for skb) Fixes: 018423e90bee ("net: ethernet: aquantia: Add ring support code") Signed-off-by: Pavel Belous <pbelous@...vell.com> Signed-off-by: Igor Russkikh <irusskikh@...vell.com> Signed-off-by: Dmitry Bogdanov <dbogdanov@...vell.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/net/ethernet/aquantia/atlantic/aq_nic.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c +++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c @@ -533,8 +533,10 @@ unsigned int aq_nic_map_skb(struct aq_ni dx_buff->len, DMA_TO_DEVICE); - if (unlikely(dma_mapping_error(aq_nic_get_dev(self), dx_buff->pa))) + if (unlikely(dma_mapping_error(aq_nic_get_dev(self), dx_buff->pa))) { + ret = 0; goto exit; + } first = dx_buff; dx_buff->len_pkt = skb->len;
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