libfstree: guard against possible overflow in readlink()

*in theory*, say on a 32 bit system, we could have a 32 bit size_t and
a 64 bit off_t. If the filesystem permitted this, we *could* then have
a symlink with a target > 4G. Or the target is exacetely 4G, but
adding a null-terminator could exceed addressable memory.

This commit adds a check to guard against such an overflow and throw
an error, instead of silently wrapping around.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

0 files changed, 0 insertions, 0 deletions