Ticket #165 (new defect)

Opened 4 years ago

Last modified 2 months ago

parser.c can possibly dereference NULL pointer

Reported by: anonymous Owned by: xi
Priority: low Component: libyaml
Severity: normal Keywords:
Cc:

Description

The following code is called in several locations in parser.c

if (first) {

token = PEEK_TOKEN(parser); if (!PUSH(parser, parser->marks, token->start_mark))

return 0;

SKIP_TOKEN(parser);

}

PEEK_TOKEN is defined as

((parser->token_available
yaml_parser_fetch_more_tokens(parser)) ? \

parser->tokens.head : NULL)

which can return NULL. This suggests that token->start_mark could cause a segfault if token is NULL.

This is hypothetical only and the checks in PEEK_TOKEN may render the situation impossible.

Output from clang --analyze parser.c below giving line numbers.

parser.c:733:14: warning: Dereference of null pointer

if (!PUSH(parser, parser->marks, token->start_mark))

parser.c:733:49: note: instantiated from:

if (!PUSH(parser, parser->marks, token->start_mark))

parser.c:842:14: warning: Dereference of null pointer

if (!PUSH(parser, parser->marks, token->start_mark))

parser.c:842:49: note: instantiated from:

if (!PUSH(parser, parser->marks, token->start_mark))

parser.c:959:14: warning: Dereference of null pointer

if (!PUSH(parser, parser->marks, token->start_mark))

parser.c:959:49: note: instantiated from:

if (!PUSH(parser, parser->marks, token->start_mark))

parser.c:1111:14: warning: Dereference of null pointer

if (!PUSH(parser, parser->marks, token->start_mark))

parser.c:1111:49: note: instantiated from:

if (!PUSH(parser, parser->marks, token->start_mark))

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