out of bounds read in tag_expand

[Hanno Böck]

And one more heap out of bounds read, visible with address sanitizer.


Stack trace:

==12951==ERROR: AddressSanitizer: heap-buffer-overflow on address 
0x60200000df40 at pc 0x0000004969bf bp 0x7ffe36779500 sp 0x7ffe36778cb0
READ of size 2 at 0x60200000df40 thread T0
    #0 0x4969be in __interceptor_memcmp.part.69 (/r/texinfo/ginfo+0x4969be)
    #1 0x579aa7 in tag_expand /f/texinfo/trunk/info/tag.c:221:7
    #2 0x525d16 in scan_info_tag /f/texinfo/trunk/info/info-utils.c:1533:7
    #3 0x525d16 in scan_node_contents /f/texinfo/trunk/info/info-utils.c:1707
    #4 0x54c9b7 in info_node_of_tag_ext /f/texinfo/trunk/info/nodes.c:1452:11
    #5 0x54ad69 in info_node_of_tag /f/texinfo/trunk/info/nodes.c:1493:10
    #6 0x54ad69 in info_get_node_of_file_buffer 
/f/texinfo/trunk/info/nodes.c:1115
    #7 0x54a573 in info_get_node_with_defaults 
/f/texinfo/trunk/info/nodes.c:998:14
    #8 0x56dea2 in dump_node_to_stream /f/texinfo/trunk/info/session.c:3764:10
    #9 0x56db72 in dump_nodes_to_file /f/texinfo/trunk/info/session.c:3727:11
    #10 0x531d99 in main /f/texinfo/trunk/info/info.c:1073:7
    #11 0x7f6b91f1178f in __libc_start_main (/lib64/libc.so.6+0x2078f)
    #12 0x41a598 in _start (/r/texinfo/ginfo+0x41a598)

0x60200000df40 is located 0 bytes to the right of 16-byte region 
[0x60200000df30,0x60200000df40)
allocated by thread T0 here:
    #0 0x4ca6f8 in malloc (/r/texinfo/ginfo+0x4ca6f8)
    #1 0x5909ae in xmalloc /f/texinfo/trunk/gnulib/lib/xmalloc.c:41:13
    #2 0x518c8a in filesys_read_info_file /f/texinfo/trunk/info/filesys.c:321:18
    #3 0x548dc2 in info_load_file /f/texinfo/trunk/info/nodes.c:733:14
    #4 0x548c1d in info_find_file /f/texinfo/trunk/info/nodes.c:670:17
    #5 0x54a543 in info_get_node_with_defaults 
/f/texinfo/trunk/info/nodes.c:993:19
    #6 0x56dea2 in dump_node_to_stream /f/texinfo/trunk/info/session.c:3764:10
    #7 0x56db72 in dump_nodes_to_file /f/texinfo/trunk/info/session.c:3727:11
    #8 0x531d99 in main /f/texinfo/trunk/info/info.c:1073:7
    #9 0x7f6b91f1178f in __libc_start_main (/lib64/libc.so.6+0x2078f)
    #10 0x41a598 in _start (/r/texinfo/ginfo+0x41a598)

SUMMARY: AddressSanitizer: heap-buffer-overflow
(/r/texinfo/ginfo+0x4969be) in __interceptor_memcmp.part.69

-- 
Hanno Böck
https://hboeck.de/

mail/jabber: address@hidden
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texinfo-oob-tag_expand.info
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