http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=2504
Jim Young <jyoung@xxxxxxx> changed:
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--- Comment #3 from Jim Young <jyoung@xxxxxxx> 2008-04-27 22:56:59 GMT ---
Created an attachment (id=1747)
--> (http://bugs.wireshark.org/bugzilla/attachment.cgi?id=1747)
quick and dirty patch to make expert_tapdata_t structs consistent
Hello All,
I was running Wireshark within valgrind and spotted one issue when using the
Expert Info Composite window.
Both of the Expert Info dialogs define and use a typedef called
expert_tapdata_t. One version of the typedef is defined in the expert_dlg.c
file, while the other is defined in expert_comp_table.h.
The typedef defined in expert_dlg.c includes 12 fields whereas the one defined
in expert_comp_table.h has 11 fields. Within expert_dlg.c's typedef the 3rd
field is a 'GtkCList *table'. The 'GtkCList *table' field is not present in
expert_comp_table.h's typedef.
Assuming that GtkClist pointers are 4 bytes in length, any etd variables
allocated within expert_comp_init() at expert_comp_dlg.c:187, will be four
bytes smaller (44 bytes) then etd variables allocated within expert_dlg_init()
at expert_dlg:493 (48 bytes).
Both expert info dialogs share some common tap functions, which reference
fields defined inside the etd variables. valgrind alerted to the fact that
expert_dlg's expert_dlg_draw() was attempting to access the variable
"etd->severity_report_level" which was beyond the end of the allocated block of
data. This particular etd structure was allocated from within
expert_comp_init().
A quick and dirty fix is to simply insert the missing 'GtkCList *table;'
statement as the 3rd field within expert_comp_dlg.h's expert_tapdata_t typedef.
This is NOT a satisfactory long term fix because it still allows for the two
expert_tapdata_t definitions to diverge.
A much better fix would be to refactor the expert*.c code so that both dialogs
include the expert_tapdata_t definition from a common header file.
The attached patch is the quick and dirty fix.
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