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http://bugs.exim.org/show_bug.cgi?id=713
Summary: SIGSEGV after header_add_* from local_scand dlfunc
module
Product: Exim
Version: 4.63
Platform: Other
OS/Version: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Filters
AssignedTo: nigel@exim.org
ReportedBy: Mikhail.Modin@kaspersky.com
CC: exim-dev@exim.org


I develop local_scan dlfunc module and have discovered problem. After call
header_add_* functions, memory allocated inside header_add_* are freed by
expand.c:5183 or maybe some other functions...

this is short debug log (full log are atteached)

*---0 Get 0x8147f00 16 header.c 175
**---0 Get 0x8147f10 136 string.c 419
---0 Get 0x8147f98 24 string.c 353
---0 Rst 0x8147bda ** expand.c 5183 24600
---0 Get 0x8147be0 24 string.c 353
---0 Get 0x8147bf8 120 expand.c 2863
---0 Get 0x8147c70 112 expand.c 2863
---0 Rst 0x8147c70 ** expand.c 2939 24600
---0 Get 0x8147c70 104 string.c 862
---0 Rst 0x8147c82 ** expand.c 5183 24600
---0 Get 0x8147c88 104 expand.c 2863
---0 Rst 0x8147c9b ** expand.c 5183 24600
---0 Get 0x8147ca0 88 exim.c 34
---0 Get 0x8147cf8 80 expand.c 2863
---0 Rst 0x8147cfc ** expand.c 5183 24600
---0 Get 0x8147d00 72 expand.c 2863
---0 Rst 0x8147d03 ** expand.c 5183 24600
---0 Rst 0x8147bfc ** expand.c 5183 24600
---0 Get 0x8147c00 32 string.c 353
---0 Get 0x8147c20 600 receive.c 472
---0 Get 0x8147e78 16 header.c 175
---0 Get 0x8147e88 72 string.c 419
---0 Get 0x8147ed0 16 header.c 175
---0 Get 0x8147ee0 32 string.c 419
***---0 Get 0x8147f00 80 expand.c 2863
***---0 Rst 0x8147f00 ** expand.c 5129 24600
***---0 Get 0x8147f00 104 string.c 862
---0 Rst 0x8147f20 ** expand.c 5183 24600

marked lines:

* - alloc memory for header_line
** - alloc memery for header_line.text
*** - allocated memory are used again without free


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