On 10/11/2016 03:39 PM, Matt Redfearn wrote:
Storage of the firmware name was inconsistent, either storing a pointer
to a name stored with unknown ownership, or a variable length tacked
onto the end of the struct proc allocated in rproc_alloc.
In preparation for allowing the firmware of an already allocated struct
rproc to be changed, the easiest way to allow reallocation of the name
is to switch to a fixed length buffer held as part of the struct rproc.
That way we can either copy the provided firmware name into it, or print
into it based on a name template. A new function,
rproc_set_firmware_name() is introduced for this purpose, and that logic
removed from rproc_alloc().
Signed-off-by: Matt Redfearn <matt.redfearn@xxxxxxxxxx>
---
drivers/remoteproc/remoteproc_core.c | 64 +++++++++++++++++++++++-------------
include/linux/remoteproc.h | 4 ++-
2 files changed, 45 insertions(+), 23 deletions(-)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index fe0539ed9cb5..48cd9d5afb69 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1309,6 +1309,42 @@ static void rproc_type_release(struct device *dev)
kfree(rproc);
}
+/**
+ * rproc_set_firmware_name() - helper to create a valid firmare name
+ * @rproc: remote processor
+ * @firmware: name of firmware file, can be NULL
+ *
+ * If the caller didn't pass in a firmware name then construct a default name,
+ * otherwise the provided name is copied into the firmware field of struct
+ * rproc. If the name is too long to fit, -EINVAL is returned.
+ *
+ * Returns 0 on success and an appropriate error code otherwise.
+ */
+static int rproc_set_firmware_name(struct rproc *rproc, const char *firmware)
+{
+ char *cp, *template = "rproc-%s-fw";
+ int name_len;
+
+ if (firmware) {
+ name_len = strlen(firmware);
+ cp = memchr(firmware, '\n', name_len);
+ if (cp)
+ name_len = cp - firmware;
+
+ if (name_len > RPROC_MAX_FIRMWARE_NAME_LEN)
Hi Matt,
As you are added '\0' at offset name_len, name_len should be < to
RPROC_MAX_FIRMWARE_NAME_LEN.
Test should be if (name_len >= RPROC_MAX_FIRMWARE_NAME_LEN)
Regards,
Loic
+ return -EINVAL;
+
+ strncpy(rproc->firmware, firmware, name_len);
+ rproc->firmware[name_len] = '\0';
+ } else {
+ snprintf(rproc->firmware, RPROC_MAX_FIRMWARE_NAME_LEN,
+ template, rproc->name);
+ }
+
+ dev_dbg(&rproc->dev, "Using firmware %s\n", rproc->firmware);
+ return 0;
+}
+
static struct device_type rproc_type = {
.name = "remoteproc",
.release = rproc_type_release,
@@ -1342,35 +1378,14 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
const char *firmware, int len)
{
struct rproc *rproc;
- char *p, *template = "rproc-%s-fw";
- int name_len = 0;
if (!dev || !name || !ops)
return NULL;
- if (!firmware)
- /*
- * Make room for default firmware name (minus %s plus '\0').
- * If the caller didn't pass in a firmware name then
- * construct a default name. We're already glomming 'len'
- * bytes onto the end of the struct rproc allocation, so do
- * a few more for the default firmware name (but only if
- * the caller doesn't pass one).
- */
- name_len = strlen(name) + strlen(template) - 2 + 1;
-
- rproc = kzalloc(sizeof(struct rproc) + len + name_len, GFP_KERNEL);
+ rproc = kzalloc(sizeof(struct rproc) + len, GFP_KERNEL);
if (!rproc)
return NULL;
- if (!firmware) {
- p = (char *)rproc + sizeof(struct rproc) + len;
- snprintf(p, name_len, template, name);
- } else {
- p = (char *)firmware;
- }
-
- rproc->firmware = p;
rproc->name = name;
rproc->ops = ops;
rproc->priv = &rproc[1];
@@ -1389,6 +1404,11 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
dev_set_name(&rproc->dev, "remoteproc%d", rproc->index);
+ if (rproc_set_firmware_name(rproc, firmware)) {
+ put_device(&rproc->dev);
+ return NULL;
+ }
+
atomic_set(&rproc->power, 0);
/* Set ELF as the default fw_ops handler */
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 1c457a8dd5a6..7a6f9ad55011 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -42,6 +42,8 @@
#include <linux/idr.h>
#include <linux/of.h>
+#define RPROC_MAX_FIRMWARE_NAME_LEN 128
+
/**
* struct resource_table - firmware resource table header
* @ver: version number
@@ -416,7 +418,7 @@ struct rproc {
struct list_head node;
struct iommu_domain *domain;
const char *name;
- const char *firmware;
+ char firmware[RPROC_MAX_FIRMWARE_NAME_LEN];
void *priv;
const struct rproc_ops *ops;
struct device dev;
--
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