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Null pointer dereference in getInt (decompile.c 477) #164

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JsHuang opened this Issue Sep 21, 2018 · 0 comments

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JsHuang commented Sep 21, 2018

A null pointer dereference bug was found in function getInt (decompile.c 477)

This is not the same issue with #133

Program received signal SIGSEGV, Segmentation fault.
0x0000000000408606 in getInt (act=0x0) at decompile.c:477
477             switch( act->Type ) 
(gdb) p act->Type
Cannot access memory at address 0x10
(gdb) p act
$3 = (struct SWF_ACTIONPUSHPARAM *) 0x0
(gdb) bt
#0  0x0000000000408606 in getInt (act=0x0) at decompile.c:477
#1  0x0000000000408668 in getInt (act=0x631450) at decompile.c:484
#2  0x000000000040b0b4 in decompileGETPROPERTY (n=11, actions=0x6337c0, maxn=14) at decompile.c:1477
#3  0x0000000000410e0b in decompileAction (n=11, actions=0x6337c0, maxn=14) at decompile.c:3260
#4  0x00000000004114dd in decompileActions (n=14, actions=0x6337c0, indent=0) at decompile.c:3494
#5  0x00000000004115df in decompile5Action (n=14, actions=0x6337c0, indent=0) at decompile.c:3517
#6  0x00000000004055e1 in outputSWF_DOACTION (pblock=0x631250) at outputscript.c:1551
#7  0x0000000000406907 in outputBlock (type=12, blockp=0x631250, stream=0x630010) at outputscript.c:2083
#8  0x000000000040737f in readMovie (f=0x630010) at main.c:281
#9  0x00000000004076cb in main (argc=2, argv=0x7fffffffe508) at main.c:354

to reproduce it ,run swftopython with segmentaion_fault_decompile_477

./swftopython segmentaion_fault_decompile_477

https://github.com/JsHuang/libming-poc/blob/master/swftopython/segmentaion_fault_decompile_477

credit: ADLab of Venustech

segmentaion_fault_decompile_477.zip

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