#29349 [Opn->Fbk]: imagecreatefromstring segfaults (fix included)

ID: 29349 Updated by: tony2001@php.net Reported By: k at ailis dot de -Status: Open +Status: Feedback Bug Type: GD related Operating System: Linux PHP Version: 4CVS-2004-07-23 (stable) New Comment: Thank you for this bug report. To properly diagnose the problem, we need a backtrace to see what is happening behind the scenes. To find out how to generate a backtrace, please read http://bugs.php.net/bugs-generating-backtrace.php Once you have generated a backtrace, please submit it to this bug report and change the status back to "Open". Thank you for helping us make PHP better. Please, provide a gdb backtrace. Previous Comments: ------------------------------------------------------------------------ [2004-07-23 12:01:03] k at ailis dot de Description: ------------ imagecreatefromstring segfaults when using the external GD library. The bundled one works. As far as I understood this problem the imagecreatefromstring function calls gdNewDynamicCTX and this function frees some memory which don't have to be freed. Maybe this function was changed in the bundled GD library. But this is not needed. Instead of gdNewDynamicCtx the function gdNewDynamicCtxEx can be used. The additional third parameter must be 0 so the function doesn't free the memory. Doing in in that way imagecreatefromstring works again in the external GD library and also in the bundled one. Here is a small patch, but please take it with care. I don't really know what you are doing there with all these memory freeing hacks. Maybe my patch creates a memory leak. Don't know. --- gd.c.orig 2004-07-23 11:24:51.000000000 +0200 +++ gd.c 2004-07-23 11:31:10.000000000 +0200 @@ -1274,7 +1274,7 @@ gdImagePtr im; gdIOCtx *io_ctx; - io_ctx = gdNewDynamicCtx (Z_STRLEN_PP(data), Z_STRVAL_PP(data)); + io_ctx = gdNewDynamicCtxEx (Z_STRLEN_PP(data), Z_STRVAL_PP(data), 0); if (!io_ctx) { return NULL; Reproduce code: --------------- Can't provide one. The bug seems to be very system dependend. It works on some machines. On others it don't. It works for some image files. With others it don't. Expected result: ---------------- No segfault. Actual result: -------------- segfault ;-) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=29349&edit=1