From 8dd0100ce9511e52614ecd0a6587c13ce5769c8b Mon Sep 17 00:00:00 2001 From: Stefano Brivio Date: Sat, 2 Feb 2008 19:16:03 +0100 Subject: [PATCH] b43legacy: fix DMA slot resource leakage This fixes four resource leakages. In any error path we must deallocate the DMA frame slots we previously allocated by request_slot(). This is done by storing the ring pointers before doing any ring allocation and restoring the old pointers in case of an error. This patch by Michael Buesch has been ported to b43legacy. Cc: Michael Buesch Signed-off-by: Stefano Brivio Signed-off-by: John W. Linville --- drivers/net/wireless/b43legacy/dma.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/b43legacy/dma.c b/drivers/net/wireless/b43legacy/dma.c index 0023de8235b..6e08405e802 100644 --- a/drivers/net/wireless/b43legacy/dma.c +++ b/drivers/net/wireless/b43legacy/dma.c @@ -1164,7 +1164,7 @@ static int dma_tx_fragment(struct b43legacy_dmaring *ring, { const struct b43legacy_dma_ops *ops = ring->ops; u8 *header; - int slot; + int slot, old_top_slot, old_used_slots; int err; struct b43legacy_dmadesc_generic *desc; struct b43legacy_dmadesc_meta *meta; @@ -1174,6 +1174,9 @@ static int dma_tx_fragment(struct b43legacy_dmaring *ring, #define SLOTS_PER_PACKET 2 B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0); + old_top_slot = ring->current_slot; + old_used_slots = ring->used_slots; + /* Get a slot for the header. */ slot = request_slot(ring); desc = ops->idx2desc(ring, slot, &meta_hdr); @@ -1184,8 +1187,11 @@ static int dma_tx_fragment(struct b43legacy_dmaring *ring, err = b43legacy_generate_txhdr(ring->dev, header, skb->data, skb->len, ctl, generate_cookie(ring, slot)); - if (unlikely(err)) + if (unlikely(err)) { + ring->current_slot = old_top_slot; + ring->used_slots = old_used_slots; return err; + } meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header, sizeof(struct b43legacy_txhdr_fw3), 1); @@ -1208,6 +1214,8 @@ static int dma_tx_fragment(struct b43legacy_dmaring *ring, if (dma_mapping_error(meta->dmaaddr)) { bounce_skb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); if (!bounce_skb) { + ring->current_slot = old_top_slot; + ring->used_slots = old_used_slots; err = -ENOMEM; goto out_unmap_hdr; } @@ -1218,6 +1226,8 @@ static int dma_tx_fragment(struct b43legacy_dmaring *ring, meta->skb = skb; meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); if (dma_mapping_error(meta->dmaaddr)) { + ring->current_slot = old_top_slot; + ring->used_slots = old_used_slots; err = -EIO; goto out_free_bounce; } -- 2.41.1