| Message ID | 20240606075204.12354-1-amishin@t-argos.ru (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | remoteproc: imx_rproc: Adjust phandle parsing issue while remapping optional addresses in imx_rproc_addr_init() | expand |
Hi Aleksandr, > Subject: [PATCH] remoteproc: imx_rproc: Adjust phandle parsing issue while > remapping optional addresses in imx_rproc_addr_init() > > In imx_rproc_addr_init() "nph = of_count_phandle_with_args()" just counts > number of phandles. But phandles may be empty. So of_parse_phandle() in > the parsing loop (0 < a < nph) may return NULL which is later dereferenced. > Adjust this issue by adding NULL-return check. It is good to add a check here. But I am not sure whether this will really happen. > > Found by Linux Verification Center (linuxtesting.org) with SVACE. > > Fixes: a0ff4aa6f010 ("remoteproc: imx_rproc: add a NXP/Freescale imx_rproc > driver") > Signed-off-by: Aleksandr Mishin <amishin@t-argos.ru> Anyway LGTM: Reviewed-by: Peng Fan <peng.fan@nxp.com> Thanks, Peng.
On Thu, Jun 06, 2024 at 10:52:04AM +0300, Aleksandr Mishin wrote: > In imx_rproc_addr_init() "nph = of_count_phandle_with_args()" just counts > number of phandles. But phandles may be empty. So of_parse_phandle() in > the parsing loop (0 < a < nph) may return NULL which is later dereferenced. > Adjust this issue by adding NULL-return check. > > Found by Linux Verification Center (linuxtesting.org) with SVACE. > > Fixes: a0ff4aa6f010 ("remoteproc: imx_rproc: add a NXP/Freescale imx_rproc driver") > Signed-off-by: Aleksandr Mishin <amishin@t-argos.ru> > --- > drivers/remoteproc/imx_rproc.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c > index 5a3fb902acc9..39eacd90af14 100644 > --- a/drivers/remoteproc/imx_rproc.c > +++ b/drivers/remoteproc/imx_rproc.c > @@ -726,6 +726,8 @@ static int imx_rproc_addr_init(struct imx_rproc *priv, > struct resource res; > > node = of_parse_phandle(np, "memory-region", a); > + if (!node) You're missing an "of_node_put()" before continuing. > + continue; > /* Not map vdevbuffer, vdevring region */ > if (!strncmp(node->name, "vdev", strlen("vdev"))) { > of_node_put(node); > -- > 2.30.2 > >
On Mon, 10. Jun 10:47, Mathieu Poirier wrote: > On Thu, Jun 06, 2024 at 10:52:04AM +0300, Aleksandr Mishin wrote: > > In imx_rproc_addr_init() "nph = of_count_phandle_with_args()" just counts > > number of phandles. But phandles may be empty. So of_parse_phandle() in > > the parsing loop (0 < a < nph) may return NULL which is later dereferenced. > > Adjust this issue by adding NULL-return check. > > > > Found by Linux Verification Center (linuxtesting.org) with SVACE. > > > > Fixes: a0ff4aa6f010 ("remoteproc: imx_rproc: add a NXP/Freescale imx_rproc driver") > > Signed-off-by: Aleksandr Mishin <amishin@t-argos.ru> > > --- > > drivers/remoteproc/imx_rproc.c | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c > > index 5a3fb902acc9..39eacd90af14 100644 > > --- a/drivers/remoteproc/imx_rproc.c > > +++ b/drivers/remoteproc/imx_rproc.c > > @@ -726,6 +726,8 @@ static int imx_rproc_addr_init(struct imx_rproc *priv, > > struct resource res; > > > > node = of_parse_phandle(np, "memory-region", a); > > + if (!node) > > You're missing an "of_node_put()" before continuing. > The node is NULL in this case so of_node_put() is not needed..? Btw, there is a "rsc-table" node->name check in the the end of the loop body. It was added recently with commit 5e4c1243071d ("remoteproc: imx_rproc: support remote cores booted before Linux Kernel"). Seems to me it forgot that of_node_put() is called way before that. Also commit 61afafe8b938 ("remoteproc: imx_rproc: Fix refcount leak in imx_rproc_addr_init") was dealing with the last of_node_put() call here but it's still not in the right place I'd say. > > + continue; > > /* Not map vdevbuffer, vdevring region */ > > if (!strncmp(node->name, "vdev", strlen("vdev"))) { > > of_node_put(node); > > -- > > 2.30.2 > > > >
On Mon, Jun 10, 2024 at 08:36:19PM +0300, Fedor Pchelkin wrote: > On Mon, 10. Jun 10:47, Mathieu Poirier wrote: > > On Thu, Jun 06, 2024 at 10:52:04AM +0300, Aleksandr Mishin wrote: > > > In imx_rproc_addr_init() "nph = of_count_phandle_with_args()" just counts > > > number of phandles. But phandles may be empty. So of_parse_phandle() in > > > the parsing loop (0 < a < nph) may return NULL which is later dereferenced. > > > Adjust this issue by adding NULL-return check. > > > > > > Found by Linux Verification Center (linuxtesting.org) with SVACE. > > > > > > Fixes: a0ff4aa6f010 ("remoteproc: imx_rproc: add a NXP/Freescale imx_rproc driver") > > > Signed-off-by: Aleksandr Mishin <amishin@t-argos.ru> > > > --- > > > drivers/remoteproc/imx_rproc.c | 2 ++ > > > 1 file changed, 2 insertions(+) > > > > > > diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c > > > index 5a3fb902acc9..39eacd90af14 100644 > > > --- a/drivers/remoteproc/imx_rproc.c > > > +++ b/drivers/remoteproc/imx_rproc.c > > > @@ -726,6 +726,8 @@ static int imx_rproc_addr_init(struct imx_rproc *priv, > > > struct resource res; > > > > > > node = of_parse_phandle(np, "memory-region", a); > > > + if (!node) > > > > You're missing an "of_node_put()" before continuing. > > > > The node is NULL in this case so of_node_put() is not needed..? Oh yeah, doing a of_node_put() with a NULL value is are really good idea... I will pickup this patch. > > Btw, there is a "rsc-table" node->name check in the the end of the loop > body. It was added recently with commit 5e4c1243071d ("remoteproc: > imx_rproc: support remote cores booted before Linux Kernel"). Seems to me > it forgot that of_node_put() is called way before that. > I agree. > Also commit 61afafe8b938 ("remoteproc: imx_rproc: Fix refcount leak in > imx_rproc_addr_init") was dealing with the last of_node_put() call here > but it's still not in the right place I'd say. > You mean becaue of node->name being used after the last of_node_put() or is there something else? Aleksandr - Can you send another patch for the above? Thanks, Mathieu > > > + continue; > > > /* Not map vdevbuffer, vdevring region */ > > > if (!strncmp(node->name, "vdev", strlen("vdev"))) { > > > of_node_put(node); > > > -- > > > 2.30.2 > > > > > >
On Tue, 11. Jun 10:45, Mathieu Poirier wrote: > On Mon, Jun 10, 2024 at 08:36:19PM +0300, Fedor Pchelkin wrote: > > Btw, there is a "rsc-table" node->name check in the the end of the loop > > body. It was added recently with commit 5e4c1243071d ("remoteproc: > > imx_rproc: support remote cores booted before Linux Kernel"). Seems to me > > it forgot that of_node_put() is called way before that. > > > > I agree. > > > Also commit 61afafe8b938 ("remoteproc: imx_rproc: Fix refcount leak in > > imx_rproc_addr_init") was dealing with the last of_node_put() call here > > but it's still not in the right place I'd say. > > > > You mean becaue of node->name being used after the last of_node_put() or is Yes, this one. Only that node->name is used after the last of_node_put(). > there something else?
On 11.06.2024 19:45, Mathieu Poirier wrote: > On Mon, Jun 10, 2024 at 08:36:19PM +0300, Fedor Pchelkin wrote: >> On Mon, 10. Jun 10:47, Mathieu Poirier wrote: >>> On Thu, Jun 06, 2024 at 10:52:04AM +0300, Aleksandr Mishin wrote: >>>> In imx_rproc_addr_init() "nph = of_count_phandle_with_args()" just counts >>>> number of phandles. But phandles may be empty. So of_parse_phandle() in >>>> the parsing loop (0 < a < nph) may return NULL which is later dereferenced. >>>> Adjust this issue by adding NULL-return check. >>>> >>>> Found by Linux Verification Center (linuxtesting.org) with SVACE. >>>> >>>> Fixes: a0ff4aa6f010 ("remoteproc: imx_rproc: add a NXP/Freescale imx_rproc driver") >>>> Signed-off-by: Aleksandr Mishin <amishin@t-argos.ru> >>>> --- >>>> drivers/remoteproc/imx_rproc.c | 2 ++ >>>> 1 file changed, 2 insertions(+) >>>> >>>> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c >>>> index 5a3fb902acc9..39eacd90af14 100644 >>>> --- a/drivers/remoteproc/imx_rproc.c >>>> +++ b/drivers/remoteproc/imx_rproc.c >>>> @@ -726,6 +726,8 @@ static int imx_rproc_addr_init(struct imx_rproc *priv, >>>> struct resource res; >>>> >>>> node = of_parse_phandle(np, "memory-region", a); >>>> + if (!node) >>> >>> You're missing an "of_node_put()" before continuing. >>> >> >> The node is NULL in this case so of_node_put() is not needed..? > > Oh yeah, doing a of_node_put() with a NULL value is are really good idea... > > I will pickup this patch. > >> >> Btw, there is a "rsc-table" node->name check in the the end of the loop >> body. It was added recently with commit 5e4c1243071d ("remoteproc: >> imx_rproc: support remote cores booted before Linux Kernel"). Seems to me >> it forgot that of_node_put() is called way before that. >> > > I agree. > >> Also commit 61afafe8b938 ("remoteproc: imx_rproc: Fix refcount leak in >> imx_rproc_addr_init") was dealing with the last of_node_put() call here >> but it's still not in the right place I'd say. >> > > You mean becaue of node->name being used after the last of_node_put() or is > there something else? > > Aleksandr - Can you send another patch for the above? Patch is sent. https://lore.kernel.org/all/20240612131714.12907-1-amishin@t-argos.ru/ > > Thanks, > Mathieu > >>>> + continue; >>>> /* Not map vdevbuffer, vdevring region */ >>>> if (!strncmp(node->name, "vdev", strlen("vdev"))) { >>>> of_node_put(node); >>>> -- >>>> 2.30.2 >>>> >>>>
diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c index 5a3fb902acc9..39eacd90af14 100644 --- a/drivers/remoteproc/imx_rproc.c +++ b/drivers/remoteproc/imx_rproc.c @@ -726,6 +726,8 @@ static int imx_rproc_addr_init(struct imx_rproc *priv, struct resource res; node = of_parse_phandle(np, "memory-region", a); + if (!node) + continue; /* Not map vdevbuffer, vdevring region */ if (!strncmp(node->name, "vdev", strlen("vdev"))) { of_node_put(node);
In imx_rproc_addr_init() "nph = of_count_phandle_with_args()" just counts number of phandles. But phandles may be empty. So of_parse_phandle() in the parsing loop (0 < a < nph) may return NULL which is later dereferenced. Adjust this issue by adding NULL-return check. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: a0ff4aa6f010 ("remoteproc: imx_rproc: add a NXP/Freescale imx_rproc driver") Signed-off-by: Aleksandr Mishin <amishin@t-argos.ru> --- drivers/remoteproc/imx_rproc.c | 2 ++ 1 file changed, 2 insertions(+)