Fix a stack-read-overflow in ncindexlookup() #2113
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Fixes an issue with strlen() reading outside the stack allocated buffer by NC4_HDF5_inq_att, when reading a name whose length is NC_MAX_NAME. Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39189 found on GDAL ==1895951== Conditional jump or move depends on uninitialised value(s) ==1895951== at 0x483EF58: strlen (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so) ==1895951== by 0x48EF73E: ncindexlookup (ncindex.c:60) ==1895951== by 0x48E81DF: nc4_find_grp_att (nc4internal.c:587) ==1895951== by 0x48E5B39: nc4_get_att_ptrs (nc4attr.c:72) ==1895951== by 0x48F98A0: NC4_HDF5_inq_att (hdf5attr.c:818) ==1895951== by 0x48847F7: nc_inq_att (dattinq.c:91) ==1895951== by 0x10D693: pr_att (ncdump.c:767) ==1895951== by 0x110ADB: do_ncdump_rec (ncdump.c:1887) ==1895951== by 0x1112F1: do_ncdump (ncdump.c:2038) ==1895951== by 0x11248B: main (ncdump.c:2478) ==1895951== ==1895951== Use of uninitialised value of size 8 ==1895951== at 0x48A24E4: crc64_little (dcrc64.c:173) ==1895951== by 0x48A27F4: NC_crc64 (dcrc64.c:229) ==1895951== by 0x4892D49: NC_hashmapkey (nchashmap.c:159) ==1895951== by 0x489314B: NC_hashmapget (nchashmap.c:263) ==1895951== by 0x48EF75F: ncindexlookup (ncindex.c:60) ==1895951== by 0x48E81DF: nc4_find_grp_att (nc4internal.c:587) ==1895951== by 0x48E5B39: nc4_get_att_ptrs (nc4attr.c:72) ==1895951== by 0x48F98A0: NC4_HDF5_inq_att (hdf5attr.c:818) ==1895951== by 0x48847F7: nc_inq_att (dattinq.c:91) ==1895951== by 0x10D693: pr_att (ncdump.c:767) ==1895951== by 0x110ADB: do_ncdump_rec (ncdump.c:1887) ==1895951== by 0x1112F1: do_ncdump (ncdump.c:2038) ==1895951==
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Reproducer file is zipped in bad.nc.zip |
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Thank you! |
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Fixes an issue with strlen() reading outside the stack allocated buffer
by NC4_HDF5_inq_att, when reading a name whose length is NC_MAX_NAME.
Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39189 found
on GDAL
==1895951== Conditional jump or move depends on uninitialised value(s)
==1895951== at 0x483EF58: strlen (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==1895951== by 0x48EF73E: ncindexlookup (ncindex.c:60)
==1895951== by 0x48E81DF: nc4_find_grp_att (nc4internal.c:587)
==1895951== by 0x48E5B39: nc4_get_att_ptrs (nc4attr.c:72)
==1895951== by 0x48F98A0: NC4_HDF5_inq_att (hdf5attr.c:818)
==1895951== by 0x48847F7: nc_inq_att (dattinq.c:91)
==1895951== by 0x10D693: pr_att (ncdump.c:767)
==1895951== by 0x110ADB: do_ncdump_rec (ncdump.c:1887)
==1895951== by 0x1112F1: do_ncdump (ncdump.c:2038)
==1895951== by 0x11248B: main (ncdump.c:2478)
==1895951==
==1895951== Use of uninitialised value of size 8
==1895951== at 0x48A24E4: crc64_little (dcrc64.c:173)
==1895951== by 0x48A27F4: NC_crc64 (dcrc64.c:229)
==1895951== by 0x4892D49: NC_hashmapkey (nchashmap.c:159)
==1895951== by 0x489314B: NC_hashmapget (nchashmap.c:263)
==1895951== by 0x48EF75F: ncindexlookup (ncindex.c:60)
==1895951== by 0x48E81DF: nc4_find_grp_att (nc4internal.c:587)
==1895951== by 0x48E5B39: nc4_get_att_ptrs (nc4attr.c:72)
==1895951== by 0x48F98A0: NC4_HDF5_inq_att (hdf5attr.c:818)
==1895951== by 0x48847F7: nc_inq_att (dattinq.c:91)
==1895951== by 0x10D693: pr_att (ncdump.c:767)
==1895951== by 0x110ADB: do_ncdump_rec (ncdump.c:1887)
==1895951== by 0x1112F1: do_ncdump (ncdump.c:2038)
==1895951==