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author | Kay Sievers <kay.sievers@vrfy.org> | 2007-08-14 15:15:12 +0200 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-10-12 14:51:01 -0700 |
commit | 7eff2e7a8b65c25920207324e56611150eb1cd9a (patch) | |
tree | 02a0eeba9d25d996233e30c18f258dfae0ae2139 /drivers/input | |
parent | 8380770c842faef3001e44662953d64ad9a93663 (diff) | |
download | kernel_samsung_smdk4412-7eff2e7a8b65c25920207324e56611150eb1cd9a.zip kernel_samsung_smdk4412-7eff2e7a8b65c25920207324e56611150eb1cd9a.tar.gz kernel_samsung_smdk4412-7eff2e7a8b65c25920207324e56611150eb1cd9a.tar.bz2 |
Driver core: change add_uevent_var to use a struct
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>
Diffstat (limited to 'drivers/input')
-rw-r--r-- | drivers/input/input.c | 62 | ||||
-rw-r--r-- | drivers/input/serio/serio.c | 11 |
2 files changed, 23 insertions, 50 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c index 5fe7555..5dc361c 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -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) - return -ENOMEM; - - envp[*cur_index] = buffer + *cur_len; + int len; - *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name); - if (*cur_len >= buffer_size) + if (add_uevent_var(env, "%s=", name)) 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) + 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_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) - return -ENOMEM; - - envp[*cur_index] = buffer + *cur_len; + int len; - *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), - "MODALIAS="); - if (*cur_len >= buffer_size) + if (add_uevent_var(env, "MODALIAS=")) return -ENOMEM; - *cur_len += input_print_modalias(buffer + *cur_len, - max(buffer_size - *cur_len, 0), - dev, 0) + 1; - 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_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; } diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c index 372ca49..b3bc15a 100644 --- a/drivers/input/serio/serio.c +++ b/drivers/input/serio/serio.c @@ -876,18 +876,14 @@ static int serio_bus_match(struct device *dev, struct device_driver *drv) #define SERIO_ADD_UEVENT_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) -static int serio_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) +static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) { struct serio *serio; - int i = 0; - int len = 0; if (!dev) return -ENODEV; @@ -900,7 +896,6 @@ static int serio_uevent(struct device *dev, char **envp, int num_envp, char *buf SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra); SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X", serio->id.type, serio->id.proto, serio->id.id, serio->id.extra); - envp[i] = NULL; return 0; } @@ -908,7 +903,7 @@ static int serio_uevent(struct device *dev, char **envp, int num_envp, char *buf #else -static int serio_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size) +static int serio_uevent(struct device *dev, struct kobj_uevent_env *env) { return -ENODEV; } |