tree 5614f5507143a5094247573532dd5f29b7d7c9d0
parent d227f133a84c1b67643857bee1badadd0f3d5846
author Steven Rostedt (Google) <rostedt@goodmis.org> 1671506790 -0500
committer Steven Rostedt (Google) <rostedt@goodmis.org> 1672781949 -0500

libtraceevent: Fix string parsing

The string parsing of tokens can be confused if the string has a backslash
at the end of the string. That is "\\\0" or \<nul>. The backslash will
skip the next character. If the next character is the end of the string,
it will read past the end of the string.

Check for end of buffer (less than or equal to 0), and if the next
character is the end of buffer, exit the loop regardless if the previous
character was a backslash.

Also fail the parsing of the event if the string is not terminated by the
quote that started it.

Link: https://lore.kernel.org/linux-trace-devel/20221219222630.54fc5bc5@gandalf.local.home

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>