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Driver core: change add_uevent_var to use a struct

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This changes the uevent buffer functions to use a struct instead of a
long list of parameters. It does no longer require the caller to do the
proper buffer termination and size accounting, which is currently wrong
in some places. It fixes a known bug where parts of the uevent
environment are overwritten because of wrong index calculations.

Many thanks to Mathieu Desnoyers for finding bugs and improving the
error handling.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kay Sievers
2007-08-14 15:15:12 +02:00
committed by Greg Kroah-Hartman
parent 8380770c84
commit 7eff2e7a8b
47 changed files with 300 additions and 636 deletions
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66
drivers/input/input.c
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@@ -859,87 +859,66 @@ static void input_dev_release(struct device *device)
* Input uevent interface - loading event handlers based on
* device bitfields.
*/
static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
char *buffer, int buffer_size, int *cur_len,
static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
const char *name, unsigned long *bitmap, int max)
{
if (*cur_index >= num_envp - 1)
int len;
if (add_uevent_var(env, "%s=", name))
return -ENOMEM;
envp[*cur_index] = buffer + *cur_len;
*cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
if (*cur_len >= buffer_size)
len = input_print_bitmap(&env->buf[env->buflen - 1],
sizeof(env->buf) - env->buflen,
bitmap, max, 0);
if (len >= (sizeof(env->buf) - env->buflen))
return -ENOMEM;
*cur_len += input_print_bitmap(buffer + *cur_len,
max(buffer_size - *cur_len, 0),
bitmap, max, 0) + 1;
if (*cur_len > buffer_size)
return -ENOMEM;
(*cur_index)++;
env->buflen += len;
return 0;
}
static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
char *buffer, int buffer_size, int *cur_len,
static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
struct input_dev *dev)
{
if (*cur_index >= num_envp - 1)
int len;
if (add_uevent_var(env, "MODALIAS="))
return -ENOMEM;
envp[*cur_index] = buffer + *cur_len;
*cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
"MODALIAS=");
if (*cur_len >= buffer_size)
len = input_print_modalias(&env->buf[env->buflen - 1],
sizeof(env->buf) - env->buflen,
dev, 0);
if (len >= (sizeof(env->buf) - env->buflen))
return -ENOMEM;
*cur_len += input_print_modalias(buffer + *cur_len,
max(buffer_size - *cur_len, 0),
dev, 0) + 1;
if (*cur_len > buffer_size)
return -ENOMEM;
(*cur_index)++;
env->buflen += len;
return 0;
}
#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
do { \
int err = add_uevent_var(envp, num_envp, &i, \
buffer, buffer_size, &len, \
fmt, val); \
int err = add_uevent_var(env, fmt, val); \
if (err) \
return err; \
} while (0)
#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
do { \
int err = input_add_uevent_bm_var(envp, num_envp, &i, \
buffer, buffer_size, &len, \
name, bm, max); \
int err = input_add_uevent_bm_var(env, name, bm, max); \
if (err) \
return err; \
} while (0)
#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
do { \
int err = input_add_uevent_modalias_var(envp, \
num_envp, &i, \
buffer, buffer_size, &len, \
dev); \
int err = input_add_uevent_modalias_var(env, dev); \
if (err) \
return err; \
} while (0)
static int input_dev_uevent(struct device *device, char **envp,
int num_envp, char *buffer, int buffer_size)
static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
{
struct input_dev *dev = to_input_dev(device);
int i = 0;
int len = 0;
INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
dev->id.bustype, dev->id.vendor,
@@ -971,7 +950,6 @@ static int input_dev_uevent(struct device *device, char **envp,
INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
envp[i] = NULL;
return 0;
}