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| author | Alan Modra <amodra@gmail.com> | 2021-05-12 15:11:43 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2021-05-12 15:41:10 +0930 |
| commit | 55b26492bbd05637f24b9b70a507e842e466b723 (patch) | |
| tree | 2941b78c943f601f7b0b23b22fb9d572bfe886f6 /binutils/dwarf.c | |
| parent | 5ab3907543816d62a8dfd0f7f342ae66814bb0eb (diff) | |
| download | gdb-55b26492bbd05637f24b9b70a507e842e466b723.zip gdb-55b26492bbd05637f24b9b70a507e842e466b723.tar.gz gdb-55b26492bbd05637f24b9b70a507e842e466b723.tar.bz2 | |
PR27853, Infinite loop in dwarf.c
Not quite infinite but much longer than it need be. The problem is
triggered by read_and_display_attr_value incrementing "data" past
"end". read_and_display_attr_value shouldn't do that, but be
defensive.
PR 27853
* dwarf.c (display_formatted_table): Test for data >= end rather
than data == end.
(process_extended_line_op): Likewise.
(display_debug_lines_raw): Likewise.
(display_debug_lines_decoded): Likewise.
Diffstat (limited to 'binutils/dwarf.c')
| -rw-r--r-- | binutils/dwarf.c | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/binutils/dwarf.c b/binutils/dwarf.c index 336a3d5..896035c 100644 --- a/binutils/dwarf.c +++ b/binutils/dwarf.c @@ -521,7 +521,7 @@ process_extended_line_op (unsigned char * data, READ_ULEB (len, data, end); header_len = data - orig_data; - if (len == 0 || data == end || len > (size_t) (end - data)) + if (len == 0 || data >= end || len > (size_t) (end - data)) { warn (_("Badly formed extended line op encountered!\n")); return header_len; @@ -574,7 +574,7 @@ process_extended_line_op (unsigned char * data, printf ("%.*s\n\n", (int) l, name); } - if (((size_t) (data - orig_data) != len + header_len) || data == end) + if (((size_t) (data - orig_data) != len + header_len) || data >= end) warn (_("DW_LNE_define_file: Bad opcode length\n")); break; @@ -4327,7 +4327,7 @@ display_formatted_table (unsigned char *data, { SKIP_ULEB (data, end); SKIP_ULEB (data, end); - if (data == end) + if (data >= end) { warn (_("%s: Corrupt format description entry\n"), table_name); return data; @@ -4340,7 +4340,7 @@ display_formatted_table (unsigned char *data, printf (_("\n The %s is empty.\n"), table_name); return data; } - else if (data == end) + else if (data >= end) { warn (_("%s: Corrupt entry count - expected %s but none found\n"), table_name, dwarf_vmatoa ("x", data_count)); @@ -4419,7 +4419,7 @@ display_formatted_table (unsigned char *data, } } - if (data == end && (datai < data_count - 1)) + if (data >= end && (datai < data_count - 1)) { warn (_("\n%s: Corrupt entries list\n"), table_name); return data; @@ -4665,7 +4665,7 @@ display_debug_lines_raw (struct dwarf_section * section, printf ("%s\t", dwarf_vmatoa ("u", val)); printf ("%.*s\n", (int)(end - name), name); - if (data == end) + if (data >= end) { warn (_("Corrupt file name table entry\n")); break; @@ -5013,7 +5013,7 @@ display_debug_lines_decoded (struct dwarf_section * section, } READ_ULEB (n_directories, data, end); - if (data == end) + if (data >= end) { warn (_("Corrupt directories list\n")); break; @@ -5037,7 +5037,7 @@ display_debug_lines_decoded (struct dwarf_section * section, READ_ULEB (content_type, format, end); READ_ULEB (form, format, end); - if (data == end) + if (data >= end) { warn (_("Corrupt directories list\n")); break; @@ -5067,7 +5067,7 @@ display_debug_lines_decoded (struct dwarf_section * section, NULL, 1, section, NULL, '\t', -1); } - if (data == end) + if (data >= end) { warn (_("Corrupt directories list\n")); break; @@ -5087,7 +5087,7 @@ display_debug_lines_decoded (struct dwarf_section * section, } READ_ULEB (n_files, data, end); - if (data == end && n_files > 0) + if (data >= end && n_files > 0) { warn (_("Corrupt file name list\n")); break; @@ -5112,7 +5112,7 @@ display_debug_lines_decoded (struct dwarf_section * section, READ_ULEB (content_type, format, end); READ_ULEB (form, format, end); - if (data == end) + if (data >= end) { warn (_("Corrupt file name list\n")); break; @@ -5159,7 +5159,7 @@ display_debug_lines_decoded (struct dwarf_section * section, NULL, 1, section, NULL, '\t', -1); } - if (data == end) + if (data >= end) { warn (_("Corrupt file name list\n")); break; |