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gve: Fix the queue page list allocated pages count 

In gve_alloc_queue_page_list(), when a page allocation fails,
qpl->num_entries will be wrong.  In this case priv->num_registered_pages
can underflow in gve_free_queue_page_list(), causing subsequent calls
to gve_alloc_queue_page_list() to fail.

Fixes: f5cedc84a3 ("gve: Add transmit and receive support")
Signed-off-by: Jeroen de Borst <jeroendb@google.com>
Reviewed-by: Catherine Sullivan <csully@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
alistair/sunxi64-5.5-dsi
Jeroen de Borst 2019-11-26 15:36:19 -08:00 committed by David S. Miller
parent 66e2f5f7c7
commit a95069ecb7
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/google/gve/gve_main.c
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@ -544,7 +544,7 @@ static int gve_alloc_queue_page_list(struct gve_priv *priv, u32 id,
}
qpl->id = id;
qpl->num_entries = pages;
qpl->num_entries = 0;
qpl->pages = kvzalloc(pages * sizeof(*qpl->pages), GFP_KERNEL);
/* caller handles clean up */
if (!qpl->pages)
@ -562,6 +562,7 @@ static int gve_alloc_queue_page_list(struct gve_priv *priv, u32 id,
/* caller handles clean up */
if (err)
return -ENOMEM;
qpl->num_entries++;
}
priv->num_registered_pages += pages;