[PATCH] librte_eal: FreeBSD contigmem prevent possible buffer overrun during module unload.

[PATCH] librte_eal: FreeBSD contigmem prevent possible buffer overrun during module unload.

[Alan Carew]

The maximum mount contiguous memory regions for FreeBSD is limited by
RTE_CONTIGMEM_MAX_NUM_BUFS, a pointer to each region is stored in
static void * contigmem_buffers[RTE_CONTIGMEM_MAX_NUM_BUFS]

A user can specify a greater amount via hw.contigmem.num_buffers,
while the allocation logic will prevent this allocation from occuring the logic
in contigmem_unload() will attempt to free hw.contigmem.num_buffers and an
overrun occurs.

This patch limits the freeing to a maximum of RTE_CONTIGMEM_MAX_NUM_BUFS.

Signed-off-by: Alan Carew <alan.carew-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
 lib/librte_eal/bsdapp/contigmem/contigmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_eal/bsdapp/contigmem/contigmem.c b/lib/librte_eal/bsdapp/contigmem/contigmem.c
index b71474a..b1a23fa 100644
--- a/lib/librte_eal/bsdapp/contigmem/contigmem.c
+++ b/lib/librte_eal/bsdapp/contigmem/contigmem.c
@@ -178,7 +178,7 @@ contigmem_unload()
 	if (contigmem_eh_tag != NULL)
 		EVENTHANDLER_DEREGISTER(process_exit, contigmem_eh_tag);
 
-	for (i = 0; i < contigmem_num_buffers; i++)
+	for (i = 0; i < RTE_CONTIGMEM_MAX_NUM_BUFS; i++)
 		if (contigmem_buffers[i] != NULL)
 			contigfree(contigmem_buffers[i], contigmem_buffer_size,
 					M_CONTIGMEM);
-- 
1.9.3

Re: [PATCH] librte_eal: FreeBSD contigmem prevent possible buffer overrun during module unload.

[De Lara Guarch, Pablo]

> -----Original Message-----
> From: dev [mailto:dev-bounces-VfR2kkLFssw@public.gmane.org] On Behalf Of Alan Carew
> Sent: Tuesday, October 14, 2014 1:19 PM
> To: dev-VfR2kkLFssw@public.gmane.org
> Subject: [dpdk-dev] [PATCH] librte_eal: FreeBSD contigmem prevent
> possible buffer overrun during module unload.
> 
> The maximum mount contiguous memory regions for FreeBSD is limited by
> RTE_CONTIGMEM_MAX_NUM_BUFS, a pointer to each region is stored in
> static void * contigmem_buffers[RTE_CONTIGMEM_MAX_NUM_BUFS]
> 
> A user can specify a greater amount via hw.contigmem.num_buffers,
> while the allocation logic will prevent this allocation from occuring the logic
> in contigmem_unload() will attempt to free hw.contigmem.num_buffers and
> an
> overrun occurs.
> 
> This patch limits the freeing to a maximum of
> RTE_CONTIGMEM_MAX_NUM_BUFS.
> 
> Signed-off-by: Alan Carew <alan.carew-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

Acked-by: Pablo de Lara <pablo.de.lara.guarch-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

Re: [PATCH] librte_eal: FreeBSD contigmem prevent possible buffer overrun during module unload.

[Thomas Monjalon]

> > The maximum mount contiguous memory regions for FreeBSD is limited by
> > RTE_CONTIGMEM_MAX_NUM_BUFS, a pointer to each region is stored in
> > static void * contigmem_buffers[RTE_CONTIGMEM_MAX_NUM_BUFS]
> > 
> > A user can specify a greater amount via hw.contigmem.num_buffers,
> > while the allocation logic will prevent this allocation from occuring the logic
> > in contigmem_unload() will attempt to free hw.contigmem.num_buffers and
> > an overrun occurs.
> > 
> > This patch limits the freeing to a maximum of
> > RTE_CONTIGMEM_MAX_NUM_BUFS.
> > 
> > Signed-off-by: Alan Carew <alan.carew-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> 
> Acked-by: Pablo de Lara <pablo.de.lara.guarch-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

Applied

Thanks
-- 
Thomas