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bnx2x: fix possible panic under memory stress

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[ Upstream commit 07b0f00964 ]

While it is legal to kfree(NULL), it is not wise to use :
put_page(virt_to_head_page(NULL))

 BUG: unable to handle kernel paging request at ffffeba400000000
 IP: [<ffffffffc01f5928>] virt_to_head_page+0x36/0x44 [bnx2x]

Reported-by: Michel Lespinasse <walken@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Ariel Elior <ariel.elior@qlogic.com>
Fixes: d46d132cc0 ("bnx2x: use netdev_alloc_frag()")
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet
2014-06-26 00:44:02 -07:00
committed by Greg Kroah-Hartman
parent 4d8eb541f3
commit eb7e73eafa
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
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@@ -745,7 +745,8 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
return;
}
bnx2x_frag_free(fp, new_data);
if (new_data)
bnx2x_frag_free(fp, new_data);
drop:
/* drop the packet and keep the buffer in the bin */
DP(NETIF_MSG_RX_STATUS,