patch_parse: fix segfault when header path contains whitespace only #5298
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When parsing header paths from a patch, we reject any patches with empty paths as malformed patches. We perform the check whether a path is empty before sanitizing it, though, which may lead to a path becoming empty after the check, e.g. if we have trimmed whitespace. This may lead to a segfault later when any part of our patching logic actually references such a path, which may then be a `NULL` pointer. Fix the issue by performing the check after sanitizing. Add tests to catch the issue as they would have produced a segfault previosuly.
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Nice one. Thanks @pks-t! |
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When parsing header paths from a patch, we reject any patches with empty
paths as malformed patches. We perform the check whether a path is empty
before sanitizing it, though, which may lead to a path becoming empty
after the check, e.g. if we have trimmed whitespace. This may lead to a
segfault later when any part of our patching logic actually references
such a path, which may then be a
NULLpointer.Fix the issue by performing the check after sanitizing. Add tests to
catch the issue as they would have produced a segfault previosuly.