| Bug #39910 | mysql_init() writes to another memory | ||
|---|---|---|---|
| Submitted: | 7 Oct 2008 13:47 | Modified: | 8 Oct 2008 17:28 |
| Reporter: | Anatoly Lyutin | Email Updates: | |
| Status: | Can't repeat | Impact on me: | |
| Category: | MySQL Server: C API (client library) | Severity: | S2 (Serious) |
| Version: | 4.1.21 | OS: | Linux (Red Hat) |
| Assigned to: | CPU Architecture: | Any | |
| Tags: | mysql_init() | ||
[7 Oct 2008 14:01]
Anatoly Lyutin
{
char buf[100];
sprintf( buf, "%d ", nCurFlag2[k] );
fwrite( buf, strlen(buf), 1, fd ); /* One fwrite */
}
copy/paste error! Sorry!
[7 Oct 2008 20:04]
Sveta Smirnova
Thank you for the report.
You complain about mysql_init, but print values of nCurFlag2[k]. Does this mean your example would work as expected if not initialize tCurMysql?
Will error occur if skip Apache part and run test like:
int main() {
mod_init();
};
?
Could you also please try with current version 4.1.23 and current GA version 5.0.67?
[8 Oct 2008 8:07]
Anatoly Lyutin
>You complain about mysql_init, but print values of nCurFlag2[k]. Does this mean your
>example would work as expected if not initialize tCurMysql?
Yes. The main tips is that if after tCurMysql we have more than 2 array, the zero element damages only in the first array. :(
>Will error occur if skip Apache part and run test like:
>int main() {
> mod_init();
>};
>?
No, I have checked this.
>Could you also please try with current version 4.1.23 and current GA version >5.0.67?
I can not try at this version unfortunately, but in 5.0.51a it works without errors.
Should I repost this issue into Apache bugzilla?
[8 Oct 2008 9:57]
Sveta Smirnova
Thank you fro the feedback. > Should I repost this issue into Apache bugzilla? Yes, it could be bug in Apache as well, although I additionally check at MySQL side.
[8 Oct 2008 10:16]
Anatoly Lyutin
Thanks you for your attention.
[8 Oct 2008 17:28]
Sveta Smirnova
Thank you for the feedback. Tried with current development 4.1 sources and could not repeat the problem. So I close the report as "Can't repeat". Feel free to reopen the report when you are able to try latest 4.1 and if bug is repeatable with it.
Description: I have attached a simple module for apache which shows a problem. I creates a array of MYSQL structures and array of int after. The array of int initialize by number "5", or "4" but not zero! After this I initialize the array of MYSQL by mysql_init(). If the number of elements MYSQL`s array equal 100, 1000, 2000 and so on. The zero element of int array became to zero!!!! If I initialize the array of MYSQL on one less then all right!! I do not understand why. Apache version is 1.3.37 gcc version is 4.1.2 20071124 (Red Hat 4.1.2-42) How to repeat: #include "httpd.h" #include "http_config.h" #include "http_core.h" #include "http_log.h" #include "http_protocol.h" #include <mysql/mysql.h> #include "ap_config.h" #include "ap_compat.h" #define MYSQLCHILDREN 1000 int nCurFlag2[MYSQLCHILDREN]; MYSQL tCurMysql[MYSQLCHILDREN]; void mod_init( ) { int k = 0; FILE *fd; for ( k = 0; k < MYSQLCHILDREN; k++ ) { nCurFlag2[k] = 5; } for ( k = 0; k < MYSQLCHILDREN; k++ ) { mysql_init( &tCurMysql[k] ); } fd = fopen( "/tmp/log", "a+"); for ( k = 0; k < MYSQLCHILDREN; k++ ) { char buf[100]; sprintf( buf, "%d ", nCurFlag2[k] ); fwrite( buf, strlen(buf), 1, fd ); fwrite( buf, strlen(buf), 1, fd ); } fclose( fd ); } /* Dispatch list for API hooks */ module MODULE_VAR_EXPORT mod_module = { STANDARD_MODULE_STUFF, mod_init,/* module nitializer */ NULL,/* create per-dir config structures */ NULL,/* merge per-dir config structures */ NULL,/* create per-server config structures */ NULL,/* merge per-server config structures */ NULL,/* table of config file commands */ NULL,/* [#8] MIME-typed-dispatched handlers */ NULL,/* [#1] URI to filename translation */ NULL,/* [#4] validate user id from request */ NULL,/* [#5] check if the user is ok _here_ */ NULL,/* [#3] check access by host address */ NULL,/* [#6] determine MIME type */ NULL, /* [#7] pre-run fixups */ NULL,/* [#9] log a transaction */ NULL, /* [#2] header parser */ NULL, /* child_init */ NULL,/* child_exit */ NULL /* [#0] post read-request */ #ifdef EAPI ,NULL, /* EAPI: add_module */ NULL,/* EAPI: remove_module */ NULL, /* EAPI: rewrite_command */ NULL /* EAPI: new_connection */ #endif }; My /tmp/log : $ tail /tmp/log 0 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 ..... 55.