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json-lexer: limit the maximum size of a given token

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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Anthony Liguori 2011-06-01 12:14:52 -05:00
parent 55f8301f76
commit 325601b47b
1 changed files with 13 additions and 0 deletions
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13
json-lexer.c
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@ -18,6 +18,8 @@
#include "qemu-common.h"
#include "json-lexer.h"
#define MAX_TOKEN_SIZE (64ULL << 20)
/*
* \"([^\\\"]|(\\\"\\'\\\\\\/\\b\\f\\n\\r\\t\\u[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]))*\"
* '([^\\']|(\\\"\\'\\\\\\/\\b\\f\\n\\r\\t\\u[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]))*'
@ -309,6 +311,17 @@ static int json_lexer_feed_char(JSONLexer *lexer, char ch)
}
lexer->state = new_state;
} while (!char_consumed);
/* Do not let a single token grow to an arbitrarily large size,
* this is a security consideration.
*/
if (lexer->token->length > MAX_TOKEN_SIZE) {
lexer->emit(lexer, lexer->token, lexer->state, lexer->x, lexer->y);
QDECREF(lexer->token);
lexer->token = qstring_new();
lexer->state = IN_START;
}
return 0;
}