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| author | Zheng Bao <fishbaozi@gmail.com> | 2022-03-01 17:22:52 +0800 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2022-03-21 16:55:46 +0000 |
| commit | 52a1898d4430e81f8249561724ab0e911ba900b8 (patch) | |
| tree | 30ad442936daecc22c620e48f25357e78ae81b57 /util/amdfwtool/data_parse.c | |
| parent | 0c893d2624716f8fab95b4d60b0a22ab69ea74c8 (diff) | |
| download | coreboot-52a1898d4430e81f8249561724ab0e911ba900b8.tar.gz coreboot-52a1898d4430e81f8249561724ab0e911ba900b8.tar.bz2 coreboot-52a1898d4430e81f8249561724ab0e911ba900b8.zip | |
amdfwtool: Check the length of matching string before accessing
If AB recovery is enabled and get a "Lx" in fw.cfg, wrong character
is got or access violation happens.
Change-Id: Ibd8ffe34fd44d860ec2115cd36117da7b02169cd
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62483
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Jason Glenesk <jason.glenesk@gmail.com>
Diffstat (limited to 'util/amdfwtool/data_parse.c')
| -rw-r--r-- | util/amdfwtool/data_parse.c | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/util/amdfwtool/data_parse.c b/util/amdfwtool/data_parse.c index 7f1bc3a1f315..e883d17d0ead 100644 --- a/util/amdfwtool/data_parse.c +++ b/util/amdfwtool/data_parse.c @@ -472,6 +472,25 @@ static int skip_comment_blank_line(char *oneline) return retval; } +char get_level_from_config(char *line, regoff_t level_index, amd_cb_config *cb_config) +{ + char lvl = 'x'; + /* If the optional level field is present, + extract the level char. */ + if (level_index != -1) { + if (cb_config->recovery_ab == 0) + lvl = line[level_index + 1]; + else if (strlen(&line[level_index]) >= 3) + lvl = line[level_index + 2]; + } + + assert(lvl == 'x' || lvl == 'X' || + lvl == 'b' || lvl == 'B' || + lvl == '1' || lvl == '2'); + + return lvl; +} + /* return value: 0: The config file can not be parsed correctly. @@ -537,16 +556,8 @@ uint8_t process_config(FILE *config, amd_cb_config *cb_config, uint8_t print_dep /* If the optional level field is present, extract the level char. */ - if (match[3].rm_so != -1) { - if (cb_config->recovery_ab == 0) - ch_lvl = oneline[match[3].rm_so + 1]; - else - ch_lvl = oneline[match[3].rm_so + 2]; - } - - assert(ch_lvl == 'x' || ch_lvl == 'X' || - ch_lvl == 'b' || ch_lvl == 'B' || - ch_lvl == '1' || ch_lvl == '2'); + ch_lvl = get_level_from_config(oneline, + match[3].rm_so, cb_config); if (find_register_fw_filename_psp_dir( &(oneline[match[1].rm_so]), |