[PATCH] config parser: fix memory corruption

[Timo Teräs]

fgets will happily write over allocated area limits. Adjusted the
buffer size according to how much is already read.

Also increase the maximum default line length, as 80 is slightly
small. It might be better if bb_get_chunk_with_continuation would
reallocate the line buffer if it was not user given.

Signed-off-by: Timo Teräs <timo.teras at iki.fi>
---
 libc/misc/internals/parse_config.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libc/misc/internals/parse_config.c b/libc/misc/internals/parse_config.c
index cbb6ef7..8404d80 100644
--- a/libc/misc/internals/parse_config.c
+++ b/libc/misc/internals/parse_config.c
@@ -60,7 +60,7 @@ static off_t bb_get_chunk_with_continuation(parser_t* parsr)
 	char *chp;
 
 	while (1) {
-		if (fgets(parsr->line + pos, parsr->line_len, parsr->fp) == NULL) {
+		if (fgets(parsr->line + pos, parsr->line_len - pos, parsr->fp) == NULL) {
 			memset(parsr->line, 0, parsr->line_len);
 			pos = -1;
 			break;
@@ -179,7 +179,7 @@ int attribute_hidden FAST_FUNC config_read(parser_t *parser, char ***tokens,
 again:
 	if (parser->data == NULL) {
 		if (parser->line_len == 0)
-			parser->line_len = 81;
+			parser->line_len = 161;
 		if (parser->data_len == 0)
 			parser->data_len += 1 + ntokens * sizeof(char *);
 		parser->data = realloc(parser->data,
-- 
1.7.0.4