Hi, I found a problem in decompile.c.
version: 0.4.8
command: swftophp poc
poc:
[decompile.c_1843_9.tar.gz](https://github.com/libming/libming/files/7273158/decompile.c_1843_9.tar.gz)

Here is the report from ASAN:
```
header indicates a filesize of 62935 but filesize is 384
<?php
$m = new SWFMovie(8);

ming_setscale(1.0);
$m->setRate(96.402344);
$m->setDimension(-11975, 1300);

/* Note: xMin and/or yMin are not 0! */

$m->setFrames(24544);
skipping 0 bytes

/* SWF_FREECHARACTER */
/*Unknown block type 1017*/
/*Unknown block type 845*/
/*Unknown block type 217*/
/*Unknown block type 378*/
Failed to find branch target!!!
Looking for: 15177

Failed to find branch target!!!
Looking for: 15196

 Stream out of sync after parse of blocktype 12 (SWF_DOACTION). 238 but expecting 237.

/* SWF_DOACTION */
ASAN:DEADLYSIGNAL
=================================================================
==68313==ERROR: AddressSanitizer: SEGV on unknown address 0x601fffffffe0 (pc 0x00000053475b bp 0x7fffd8016df0 sp 0x7fffd8016b90 T0)
==68313==The signal is caused by a READ memory access.
    #0 0x53475a in decompileJUMP /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/decompile.c:1843:9
    #1 0x52c192 in decompileAction /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/decompile.c:3232:10
    #2 0x545f60 in decompileActions /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/decompile.c:3401:6
    #3 0x545b66 in decompile5Action /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/decompile.c:3423:2
    #4 0x51f261 in outputSWF_DOACTION /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/outputscript.c:1548:29
    #5 0x51c3c9 in outputBlock /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/outputscript.c:2079:4
    #6 0x52855e in readMovie /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/main.c:277:4
    #7 0x526bbc in main /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/main.c:350:2
    #8 0x7f100c04083f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
    #9 0x419ed8 in _start (/home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/swftophp+0x419ed8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/decompile.c:1843:9 in decompileJUMP
==68313==ABORTING
```
SEGV in decompileJUMP
This is a GitHub Issue
repo:libming
owner:libming
Title : SEGV in decompileJUMP
Issue date:

--- start body ---
Hi, I found a problem in decompile.c.
version: 0.4.8
command: swftophp poc
poc:
[decompile.c_1843_9.tar.gz](https://github.com/libming/libming/files/7273158/decompile.c_1843_9.tar.gz)

Here is the report from ASAN:
```
header indicates a filesize of 62935 but filesize is 384
<?php
$m = new SWFMovie(8);

ming_setscale(1.0);
$m->setRate(96.402344);
$m->setDimension(-11975, 1300);

/* Note: xMin and/or yMin are not 0! */

$m->setFrames(24544);
skipping 0 bytes

/* SWF_FREECHARACTER */
/*Unknown block type 1017*/
/*Unknown block type 845*/
/*Unknown block type 217*/
/*Unknown block type 378*/
Failed to find branch target!!!
Looking for: 15177

Failed to find branch target!!!
Looking for: 15196

 Stream out of sync after parse of blocktype 12 (SWF_DOACTION). 238 but expecting 237.

/* SWF_DOACTION */
ASAN:DEADLYSIGNAL
=================================================================
==68313==ERROR: AddressSanitizer: SEGV on unknown address 0x601fffffffe0 (pc 0x00000053475b bp 0x7fffd8016df0 sp 0x7fffd8016b90 T0)
==68313==The signal is caused by a READ memory access.
    #0 0x53475a in decompileJUMP /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/decompile.c:1843:9
    #1 0x52c192 in decompileAction /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/decompile.c:3232:10
    #2 0x545f60 in decompileActions /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/decompile.c:3401:6
    #3 0x545b66 in decompile5Action /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/decompile.c:3423:2
    #4 0x51f261 in outputSWF_DOACTION /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/outputscript.c:1548:29
    #5 0x51c3c9 in outputBlock /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/outputscript.c:2079:4
    #6 0x52855e in readMovie /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/main.c:277:4
    #7 0x526bbc in main /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/main.c:350:2
    #8 0x7f100c04083f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
    #9 0x419ed8 in _start (/home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/swftophp+0x419ed8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /home/radon/Documents/project/libming/libming-0_4_8/obj-asan/util/../../util/decompile.c:1843:9 in decompileJUMP
==68313==ABORTING
```
--- end body ---

A segmentation fault (SEGV) in the decompileJUMP function of libming version 0.4.8 can be exploited by providing a specially crafted SWF file, leading to a potential Denial of Service (DoS) condition. The issue arises from improper handling of the SWF file's structure, which can result in a read access violation when the program attempts to access memory that it should not.