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Top Forums Programming how to avoid the segfault from Address 0x1cd00000103 out of bounds Post 302276522 by cdbug on Wednesday 14th of January 2009 02:40:57 AM
Old 01-14-2009
Let me show it here:

node->is_done = (int *) malloc(sizeof(int));
node->hood = (double *) malloc(sizeof(double));
node->c = (int *) malloc(sizeof(int));
node->site = (double *) malloc(sizeof(double));
node->site2 = (double *) malloc(sizeof(double));double
node->des = (double *) malloc(sizeof(double));
node->asc = (double *) malloc(sizeof(double));

//null checking

node->is_done = 0;
node->hood = 0;
node->c = 1;
node->site = 0;
node->site2 = 0;
node->des = 0;
node->asc = 0

But, use of these varialbes in code will lead to segfaults, e.g. if(node->is_done) { --- }

check these varialbes, those showing 'address 0x1cd00000103 out of bounds' will finally lead to segments

I should remind that some nodes but not all the nodes in a tree will give segfaults when checking if(node->is_done)

It is said that unsuccessful initialization is the source of 'Address 0x1cd00000103 out of bounds'. Concretely speaking, how to avoid such unsuccessful initialization occur in some nodes?

Can we take some measures?
 

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mod_security(3erl)					     Erlang Module Definition						mod_security(3erl)

NAME
mod_security - Security Audit and Trailing Functionality DESCRIPTION
Security Audit and Trailing Functionality EXPORTS
list_auth_users(Port) -> Users | [] list_auth_users(Address, Port) -> Users | [] list_auth_users(Port, Dir) -> Users | [] list_auth_users(Address, Port, Dir) -> Users | [] Types Port = integer() Address = {A,B,C,D} | string() | undefined Dir = string() Users = list() = [string()] list_auth_users/1 , list_auth_users/2 and list_auth_users/3 returns a list of users that are currently authenticated. Authentica- tions are stored for SecurityAuthTimeout seconds, and are then discarded. list_blocked_users(Port) -> Users | [] list_blocked_users(Address, Port) -> Users | [] list_blocked_users(Port, Dir) -> Users | [] list_blocked_users(Address, Port, Dir) -> Users | [] Types Port = integer() Address = {A,B,C,D} | string() | undefined Dir = string() Users = list() = [string()] list_blocked_users/1 , list_blocked_users/2 and list_blocked_users/3 returns a list of users that are currently blocked from access. block_user(User, Port, Dir, Seconds) -> true | {error, Reason} block_user(User, Address, Port, Dir, Seconds) -> true | {error, Reason} Types User = string() Port = integer() Address = {A,B,C,D} | string() | undefined Dir = string() Seconds = integer() | infinity Reason = no_such_directory block_user/4 and block_user/5 blocks the user User from the directory Dir for a specified amount of time. unblock_user(User, Port) -> true | {error, Reason} unblock_user(User, Address, Port) -> true | {error, Reason} unblock_user(User, Port, Dir) -> true | {error, Reason} unblock_user(User, Address, Port, Dir) -> true | {error, Reason} Types User = string() Port = integer() Address = {A,B,C,D} | string() | undefined Dir = string() Reason = term() unblock_user/2 , unblock_user/3 and unblock_user/4 removes the user User from the list of blocked users for the Port (and Dir) spec- ified. THE SECURITYCALLBACKMODULE
The SecurityCallbackModule is a user written module that can receive events from the mod_security Erlang Webserver API module. This module only exports the function(s), event/4,5 , which are described below. EXPORTS
event(What, Port, Dir, Data) -> ignored event(What, Address, Port, Dir, Data) -> ignored Types What = atom() Port = integer() Address = {A,B,C,D} | string() <v>Dir = string() Data = [Info] Info = {Name, Value} event/4 or event/4 is called whenever an event occurs in the mod_security Erlang Webserver API module ( event/4 is called if Address is undefined and event/5 otherwise). The What argument specifies the type of event that has occurred, and should be one of the fol- lowing reasons; auth_fail (a failed user authentication), user_block (a user is being blocked from access) or user_unblock (a user is being removed from the block list). Note: Note that the user_unblock event is not triggered when a user is removed from the block list explicitly using the unblock_user function. Ericsson AB inets 5.5.2 mod_security(3erl)
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