Hdp for hdf4-tools null pointer dereference

[Andrey Fedotov]

Hello,
Below is some description about crash, found by dynamic analysis tool Sydr (part of Crusher system) https://www.ispras.ru/en/technologies/sydr/ developed in ISP RAS.

Dereference is occured at HDstrcmp function at cdf.c:1969

Starting program: /home/fedotoff/hdp-test/hdp-crash/libhdf4-4.2.14/install/bin/hdp dumpsds ./segfault19.hdf

Breakpoint 1, hdf_read_dims (xdrs=0x5193a0, handle=0x518330, vg=805306368) at cdf.c:1814
1814 char vgname[H4_MAX_NC_NAME] = "";
(gdb) c
Continuing.

Breakpoint 2, hdf_read_dims (xdrs=0x5193a0, handle=0x518330, vg=805306368) at cdf.c:1969
1969 if (!HDstrcmp(vgname, dimension[i]->name->values) &&
(gdb) c
Continuing.

Breakpoint 2, hdf_read_dims (xdrs=0x5193a0, handle=0x518330, vg=805306368) at cdf.c:1969
1969 if (!HDstrcmp(vgname, dimension[i]->name->values) &&
(gdb) p vgname
$5 = "fakeDim2", '\000' <repeats 247 times>
(gdb) p dimension[i]->name->values
$6 = 0x0

Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7d6db82 in ?? () from /usr/lib/x86_64-linux-gnu/libc.so.6