From: Bernhard Reutner-Fischer Date: Thu, 17 Jul 2008 11:59:13 +0000 (-0000) Subject: - fix segfault in nameif with mactab file X-Git-Tag: 1_12_0~162 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=679212836a881b53382ea6bd811f38e00705d50d;p=oweals%2Fbusybox.git - fix segfault in nameif with mactab file (by fixing and shrink config parser) function old new delta config_free_data - 37 +37 config_open 43 48 +5 pack_gzip 1658 1660 +2 nameif_main 527 525 -2 SynchronizeFile 629 623 -6 make_device 1184 1176 -8 config_close 31 18 -13 config_read 431 393 -38 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 2/5 up/down: 44/-67) Total: -23 bytes --- diff --git a/include/libbb.h b/include/libbb.h index c124b1a5e..aafdfa32c 100644 --- a/include/libbb.h +++ b/include/libbb.h @@ -995,7 +995,7 @@ typedef struct parser_t { char *line, *data; int lineno; } parser_t; -FILE* config_open(parser_t *parser, const char *filename) FAST_FUNC; +parser_t* config_open(const char *filename) FAST_FUNC; /* TODO: add define magic to collapse ntokens/mintokens/comment into one int param */ int config_read(parser_t *parser, char **tokens, int ntokens, int mintokens, const char *delims, char comment) FAST_FUNC; void config_close(parser_t *parser) FAST_FUNC; diff --git a/libbb/parse_config.c b/libbb/parse_config.c index f07099285..70f933fe3 100644 --- a/libbb/parse_config.c +++ b/libbb/parse_config.c @@ -31,44 +31,42 @@ Typical usage: */ -FILE* FAST_FUNC config_open(parser_t *parser, const char *filename) +parser_t* FAST_FUNC config_open(const char *filename) { - // empty file configures nothing! + parser_t *parser = xzalloc(sizeof(parser_t)); + /* empty file configures nothing */ parser->fp = fopen_or_warn(filename, "r"); - if (!parser->fp) - return parser->fp; - - // init parser - parser->line = NULL; - parser->lineno = 0; - - return parser->fp; + if (parser->fp) + return parser; + config_close (parser); + if (ENABLE_FEATURE_CLEAN_UP) + free(parser); + return NULL; } -void FAST_FUNC config_close(parser_t *parser) +static void config_free_data(parser_t *const parser) { free(parser->line); free(parser->data); + parser->line = parser->data = NULL; +} +void FAST_FUNC config_close(parser_t *parser) +{ + config_free_data(parser); fclose(parser->fp); } -int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mintokens, const char *delims, char comment) +int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mintokens, const char*delims,char comment) { char *line, *q; - int token_num, len; - int noreduce = (ntokens < 0); // do not treat subsequent delimiters as one delimiter - - if (ntokens < 0) + int ii; + /* do not treat subsequent delimiters as one delimiter */ + bool noreduce = (ntokens < 0); + if (noreduce) ntokens = -ntokens; - // nullify tokens memset(tokens, 0, sizeof(void *) * ntokens); - - // free used line - free(parser->line); - parser->line = NULL; - free(parser->data); - parser->data = NULL; + config_free_data(parser); while (1) { int n; @@ -82,13 +80,13 @@ int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mint parser->lineno++; // handle continuations. Tito's code stolen :) while (1) { - len = strlen(line); - if (!len) - goto free_and_cont; - if (line[len - 1] != '\\') + ii = strlen(line); + if (!ii) + goto next_line; + if (line[ii - 1] != '\\') break; // multi-line object - line[--len] = '\0'; + line[--ii] = '\0'; //TODO: add xmalloc_fgetline-like iface but with appending to existing str q = xmalloc_fgetline(parser->fp); if (q) { @@ -101,34 +99,35 @@ int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mint if (comment) { q = strchrnul(line, comment); *q = '\0'; - len = q - line; + ii = q - line; } // skip leading delimiters n = strspn(line, delims); if (n) { - len -= n; + ii -= n; strcpy(line, line + n); } - if (len) + if (ii) break; - // skip empty lines - free_and_cont: + + next_line: + /* skip empty line */ free(line); } // non-empty line found, parse and return // store line - parser->line = line = xrealloc(line, len + 1); + parser->line = line = xrealloc(line, ii + 1); parser->data = xstrdup(line); // now split line to tokens //TODO: discard consecutive delimiters? - token_num = 0; + ii = 0; ntokens--; // now it's max allowed token no while (1) { // get next token - if (token_num == ntokens) + if (ii == ntokens) break; q = line + strcspn(line, delims); if (!*q) @@ -136,20 +135,20 @@ int FAST_FUNC config_read(parser_t *parser, char **tokens, int ntokens, int mint // pin token *q++ = '\0'; if (noreduce || *line) { - tokens[token_num++] = line; -//bb_error_msg("L[%d] T[%s]", token_num, line); + tokens[ii++] = line; +//bb_info_msg("L[%d] T[%s]\n", ii, line); } line = q; - } + } // non-empty remainder is also a token, // so if ntokens <= 1, we just return the whole line if (noreduce || *line) - tokens[token_num++] = line; + tokens[ii++] = line; - if (token_num < mintokens) + if (ii < mintokens) bb_error_msg_and_die("bad line %u: %d tokens found, %d needed", - parser->lineno, token_num, mintokens); + parser->lineno, ii, mintokens); - return token_num; + return ii; } diff --git a/miscutils/crond.c b/miscutils/crond.c index 41f151753..d8423cf4f 100644 --- a/miscutils/crond.c +++ b/miscutils/crond.c @@ -443,7 +443,7 @@ static void FixDayDow(CronLine *line) static void SynchronizeFile(const char *fileName) { - struct parser_t parser; + struct parser_t *parser; struct stat sbuf; int maxLines; char *tokens[6]; @@ -455,12 +455,13 @@ static void SynchronizeFile(const char *fileName) return; DeleteFile(fileName); - if (!config_open(&parser, fileName)) + parser = config_open(fileName); + if (!parser) return; maxLines = (strcmp(fileName, "root") == 0) ? 65535 : MAXLINES; - if (fstat(fileno(parser.fp), &sbuf) == 0 && sbuf.st_uid == DaemonUid) { + if (fstat(fileno(parser->fp), &sbuf) == 0 && sbuf.st_uid == DaemonUid) { CronFile *file = xzalloc(sizeof(CronFile)); CronLine **pline; int n; @@ -468,11 +469,11 @@ static void SynchronizeFile(const char *fileName) file->cf_User = xstrdup(fileName); pline = &file->cf_LineBase; - while (--maxLines && (n=config_read(&parser, tokens, 6, 0, " \t", '#')) >= 0) { + while (--maxLines && (n=config_read(parser, tokens, 6, 0, " \t", '#')) >= 0) { CronLine *line; if (DebugOpt) { - crondlog(LVL5 "user:%s entry:%s", fileName, parser.data); + crondlog(LVL5 "user:%s entry:%s", fileName, parser->data); } /* check if line is setting MAILTO= */ @@ -519,7 +520,7 @@ static void SynchronizeFile(const char *fileName) crondlog(WARN9 "user %s: too many lines", fileName); } } - config_close(&parser); + config_close(parser); } static void CheckUpdates(void) diff --git a/networking/nameif.c b/networking/nameif.c index c5a715e36..291780a28 100644 --- a/networking/nameif.c +++ b/networking/nameif.c @@ -160,12 +160,12 @@ int nameif_main(int argc, char **argv) prepend_new_eth_table(&clist, ifname, *argv++); } } else { - struct parser_t parser; - if (config_open(&parser, fname)) { + struct parser_t *parser = config_open(fname); + if (parser) { char *tokens[2]; - while (config_read(&parser, tokens, 2, 2, " \t", '#') >= 0) + while (config_read(parser, tokens, 2, 2, " \t", '#') >= 0) prepend_new_eth_table(&clist, tokens[0], tokens[1]); - config_close(&parser); + config_close(parser); } } diff --git a/util-linux/mdev.c b/util-linux/mdev.c index c04410c0c..f83dd6adf 100644 --- a/util-linux/mdev.c +++ b/util-linux/mdev.c @@ -94,14 +94,14 @@ static void make_device(char *path, int delete) type = S_IFBLK; if (ENABLE_FEATURE_MDEV_CONF) { - parser_t parser; + parser_t *parser = config_open("/etc/mdev.conf"); char *tokens[5]; /* If we have config file, look up user settings */ - if (!config_open(&parser, "/etc/mdev.conf")) + if (!parser) goto end_parse; - while (config_read(&parser, tokens, 4, 3, " \t", '#') >= 0) { + while (config_read(parser, tokens, 4, 3, " \t", '#') >= 0) { regmatch_t off[1+9*ENABLE_FEATURE_MDEV_RENAME_REGEXP]; char *val; @@ -213,7 +213,7 @@ static void make_device(char *path, int delete) const char *s2 = strchr(s, *val); if (!s2) - bb_error_msg_and_die("bad line %u", parser.lineno); + bb_error_msg_and_die("bad line %u", parser->lineno); /* Correlate the position in the "@$*" with the delete * step so that we get the proper behavior: @@ -229,7 +229,7 @@ static void make_device(char *path, int delete) break; /* we found matching line, stop */ } /* end of "while line is read from /etc/mdev.conf" */ - config_close(&parser); + config_close(parser); } end_parse: