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Bug #57403 Memory Access Error
Submitted: 2006-11-28 08:49 UTC Modified: 2020-11-03 17:45 UTC
Votes:4
Avg. Score:3.5 ± 0.9
Reproduced:2 of 2 (100.0%)
Same Version:2 (100.0%)
Same OS:1 (50.0%)
From: adv at mdgrosse dot net Assigned:
Status: Suspended Package: POP3 (PECL)
PHP Version: 5.2.0 RC4 OS: Linux, RH ES 4
Private report: No CVE-ID: None
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From: adv at mdgrosse dot net
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 [2006-11-28 08:49 UTC] adv at mdgrosse dot net 
Description:
------------
I have an POP3-account with several 1000 mails. When I call pop3_get_message I occasionally get a memory access error.





Reproduce code:
---------------
I think the problem lies in the _pop3_fetch_message_part function. It can happen that the ending '\0' is written beyond the buffer.
Proposed solution: Reserve "size+1" bytes memory.

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 [2007-11-08 11:42 UTC] gk at gknw dot de 
my POP3 account currently holds 3617 mails, and I get:
Mailbox message count: 3617
zend_mm_heap corrupted

I tried increasing the memory by one byte as you suggested, but still no go; I hope I did it at the right place - and that's what you mean??

--- pop3.c.orig	Mon Jul 25 23:47:04 2005
+++ pop3.c	Thu Nov 08 17:39:19 2007
@@ -172,8 +172,12 @@
 
 	intern = emalloc(sizeof(pop3_object));
 	intern->zo.ce = class_type;
+#if ZEND_MODULE_API_NO >= 20050922
+	intern->zo.guards = NULL;
+#else
 	intern->zo.in_get = 0;
 	intern->zo.in_set = 0;
+#endif /* ZEND_MODULE_API_NO >= 20050922 */
 	intern->zo.properties = NULL;
 	intern->ptr = NULL;
 
@@ -750,7 +754,7 @@
 	}
 
 	size = 2048;
-	result = emalloc(size);
+	result = emalloc(size + 1);
 	length = 0;
 
 	do {
 [2020-11-03 17:45 UTC] cmb@php.net
-Status: Open +Status: Suspended
 [2020-11-03 17:45 UTC] cmb@php.net 
The POP3 extension is unmaintained (it had its latest release 15
years ago).  Until a new maintainer steps up, I'm suspending this
ticket.
 
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