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--- a/sys/bus/isa/pnp.c +++ b/sys/bus/isa/pnp.c @@ -403,7 +403,7 @@ /* * Trim trailing spaces. */ - while (buf[large_len-1] == ' ') + while (large_len > 0 && buf[large_len-1] == ' ') large_len--; buf[large_len] = '\0'; desc = buf;